diff --git a/service/file_sync_service.py b/service/file_sync_service.py
index c4bbb17..a341270 100644
--- a/service/file_sync_service.py
+++ b/service/file_sync_service.py
@@ -9,6 +9,45 @@ from pathlib import Path
 from .twoway_sync_folder_service import *
 import shutil
 
+@server.PromptServer.instance.routes.post('/workspace/file/save')
+async def save_file(request):
+    reqJson = await request.json()
+    data = await asyncio.to_thread(save_file_sync, reqJson)
+    return web.json_response(data, content_type='application/json')
+
+def save_file_sync(reqJson):
+    current_path = reqJson.get('path')
+    new_json_data_str = reqJson.get('json')
+    try:
+        new_json_data = json.loads(new_json_data_str)
+    except json.JSONDecodeError:
+        return { "error": "New JSON data is not valid JSON."}
+    expected_id = new_json_data.get('extra', {}).get('workspace_info', {}).get('id', None)
+    
+    try:
+        with open(current_path, 'r', encoding='utf-8') as file:
+            current_json_data = json.load(file)
+        # Extract the id from the current file's content
+        current_id = current_json_data.get('extra', {}).get('workspace_info', {}).get('id', None)
+
+        # Compare the current id with the expected id
+        if current_id is not None and current_id != expected_id:
+            return {"error": "Mismatching workspace_info.id."}
+    except json.JSONDecodeError:
+        # If there's a JSON decode error, it means the file is not a valid JSON
+        return { "error": "Existing file is not a valid JSON."}
+    except FileNotFoundError:
+        # This block is optional since os.path.exists already checks for the file's existence
+        return {"error": "File not found."}
+    
+    # If checks pass, write the new JSON data to the file
+    try:
+        with open(current_path, 'w', encoding='utf-8') as file:
+            file.write(new_json_data_str)
+        return {"success": True}
+    except Exception as e:
+        return { "error": str(e)}
+
 @server.PromptServer.instance.routes.post('/workspace/file/rename')
 async def rename_file(request):
     reqJson = await request.json()
diff --git a/service/scan_my_workflows_folder.py b/service/scan_my_workflows_folder.py
index 390214c..a130c82 100644
--- a/service/scan_my_workflows_folder.py
+++ b/service/scan_my_workflows_folder.py
@@ -1,75 +1,45 @@
-import os
-import json
-import uuid
-import tempfile
-import server
-import asyncio
 from aiohttp import web
+import asyncio
+import json
+import os
+import glob
+from threading import Lock
+import server
 
-id_cache = {}
-# Scan .json and folders in the given path
-@server.PromptServer.instance.routes.post("/workspace/scan_my_workflows_files")
-async def scan_local_new_files(request):
+@server.PromptServer.instance.routes.post('/workspace/file/scan_dup_id')
+async def scan_my_workflows_folder_recursive(request):
     reqJson = await request.json()
-    path = reqJson['path']
-    print("Scanning path: ", path)
-    
-    fileList = await asyncio.to_thread(folder_handle, path)
-    return web.Response(text=json.dumps(fileList), content_type='application/json')
+    path = reqJson.get('path')
+    data = await asyncio.to_thread(scan_folder_sync, path)
+    return web.json_response(data, content_type='application/json')
 
-def folder_handle(path):
-    global id_cache
-    fileList = []
-    for item in os.listdir(path):
-        try:
-            item_path = os.path.join(path, item)
-            if os.path.isfile(item_path) and item_path.endswith('.json'):
-                stats = os.stat(item_path)
-                creation_time = stats.st_ctime
-                update_time = stats.st_mtime
-                with open(item_path, 'r', encoding='utf-8') as f:
-                    file_handle(item, f, fileList, item_path, creation_time, update_time)
+def scan_folder_sync(path):
+    id_cache = {}  # Reset cache for each call
+    id_cache_lock = Lock()  # Ensure thread safety
 
-            elif os.path.isdir(item_path):
-                fileList.append({
-                    'name': item,
-                    'type': 'folder',
-                })
-        except Exception as e:
-            print(f"Error scanning file {item}: {e}")
-    return fileList
+    def scan_folder(path):
+        for json_file in glob.glob(os.path.join(path, '**/*.json'), recursive=True):
+            with open(json_file, 'r', encoding='utf-8') as file:
+                try:
+                    data = json.load(file)
+                    if 'extra' in data and 'workspace_info' in data['extra'] and 'id' in data['extra']['workspace_info']:
+                        workspace_id = data['extra']['workspace_info']['id']
+                        file_info = {
+                            'path': json_file,
+                            'createTime': os.path.getctime(json_file)
+                        }
+
+                        with id_cache_lock:
+                            if workspace_id in id_cache:
+                                id_cache[workspace_id].append(file_info)
+                            else:
+                                id_cache[workspace_id] = [file_info]
+                except json.JSONDecodeError:
+                    print(f"Error decoding JSON from file: {json_file}")
+
+    scan_folder(path)
+
+    duplicates = {workspace_id: infos for workspace_id, infos in id_cache.items() if len(infos) > 1}
+    return {'duplicates': duplicates}
 
-def file_handle(name, file, fileList, file_path, creation_time, update_time):
-    json_data = json.load(file)
-    if 'extra' in json_data and 'workspace_info' in json_data['extra'] and 'id' in json_data['extra']['workspace_info']:
-        workflow_id = json_data['extra']['workspace_info']['id']
-        if workflow_id in id_cache and id_cache[workflow_id] < creation_time:
-            # File with later creation time found, assign new ID
-            workflow_id = str(uuid.uuid4())
-            json_data['extra']['workspace_info']['id'] = workflow_id
-            atomic_json_update(file_path, json_data)
-        id_cache[workflow_id] = creation_time
-    else:
-        # If ID does not exist, generate a new UUID and add it to the JSON data
-        workflow_id = str(uuid.uuid4())
-        json_data.setdefault('extra', {}).setdefault('workspace_info', {})['id'] = workflow_id
-        atomic_json_update(file_path, json_data)
-        id_cache[workflow_id] = creation_time
-    fileInfo = {
-            'json': json.dumps(json_data),
-            'name': name,
-            'type': "workflow",
-            'id': workflow_id,
-            'createTime': creation_time,
-            'updateTime': update_time
-        }
-    fileList.append(fileInfo)
 
-def atomic_json_update(filepath, data):
-    # Generate a temporary file
-    dir_name, file_name = os.path.split(filepath)
-    with tempfile.NamedTemporaryFile(mode='w', encoding='utf-8', dir=dir_name, delete=False) as tmp_file:
-        json.dump(data, tmp_file, indent=4)
-        temp_name = tmp_file.name
-    # Replace the old file with the new file atomically
-    os.replace(temp_name, filepath)
diff --git a/ui/src/App.tsx b/ui/src/App.tsx
index 866e8d3..ed4f604 100644
--- a/ui/src/App.tsx
+++ b/ui/src/App.tsx
@@ -73,7 +73,6 @@ export default function App() {
       const graphJson = JSON.stringify(app.graph.serialize());
       await Promise.all([
         workflowsTable?.updateFlow(curFlowID.current, {
-          lastSavedJson: graphJson,
           json: graphJson,
         }),
         changelogsTable?.create({
@@ -176,7 +175,7 @@ export default function App() {
 
   const checkIsDirty = async () => {
     if (curFlowID.current != null) {
-      const curWorkflow = await workflowsTable?.get(curFlowID.current, false);
+      const curWorkflow = await workflowsTable?.get(curFlowID.current);
       return !!curWorkflow && checkIsDirtyImpl(curWorkflow);
     }
     return false;
diff --git a/ui/src/RecentFilesDrawer/FilesListFolderItem.tsx b/ui/src/RecentFilesDrawer/FilesListFolderItem.tsx
index c1c683d..ef0fc80 100644
--- a/ui/src/RecentFilesDrawer/FilesListFolderItem.tsx
+++ b/ui/src/RecentFilesDrawer/FilesListFolderItem.tsx
@@ -67,7 +67,7 @@ export default memo(function FilesListFolderItem({ folder }: Props) {
         parentFolderID: folder.id,
       });
     } else if (!isFolder(draggingFile)) {
-      await workflowsTable?.updateFlow(draggingFile.id, {
+      await workflowsTable?.updateFolder(draggingFile.id, {
         parentFolderID: folder.id,
       });
     }
diff --git a/ui/src/RecentFilesDrawer/ItemsList.tsx b/ui/src/RecentFilesDrawer/ItemsList.tsx
index 3f4feb8..65fbfb4 100644
--- a/ui/src/RecentFilesDrawer/ItemsList.tsx
+++ b/ui/src/RecentFilesDrawer/ItemsList.tsx
@@ -35,7 +35,7 @@ export default function ItemsList({
         parentFolderID: parentFolderID,
       });
     } else {
-      await workflowsTable?.updateFlow(draggingFile.id, {
+      await workflowsTable?.updateFolder(draggingFile.id, {
         parentFolderID: parentFolderID,
       });
     }
diff --git a/ui/src/apis/TwowaySyncApi.ts b/ui/src/apis/TwowaySyncApi.ts
index 6894cf2..24b4d84 100644
--- a/ui/src/apis/TwowaySyncApi.ts
+++ b/ui/src/apis/TwowaySyncApi.ts
@@ -4,6 +4,7 @@ import { userSettingsTable } from "../db-tables/WorkspaceDB";
 import { indexdb } from "../db-tables/indexdb";
 import { Workflow } from "../types/dbTypes";
 import { genAbsPathByRelPath, sanitizeAbsPath } from "../utils/OsPathUtils";
+import { TwowayFolderSyncAPI } from "./TwowaySyncFolderApi";
 
 export namespace TwowaySyncAPI {
   async function genWorkflowAbsPath({
@@ -99,16 +100,57 @@ export namespace TwowaySyncAPI {
     }
   }
 
+  interface DuplicatesResponse {
+    duplicates: {
+      [id: string]: Array<{
+        path: string;
+        createTime: number;
+      }>;
+    };
+  }
+  export async function scanMyWorkflowsDupId() {
+    const myWorkflowsDir =
+      await userSettingsTable?.getSetting("myWorkflowsDir");
+    const absPath = sanitizeAbsPath(myWorkflowsDir!);
+    try {
+      const response = await fetch("/workspace/file/scan_dup_id", {
+        method: "POST",
+        headers: {
+          "Content-Type": "application/json",
+        },
+        body: JSON.stringify({
+          path: absPath,
+        }),
+      });
+      const result = (await response.json()) as DuplicatesResponse;
+      console.log("scanMyWorkflowsDupId", result);
+      return true;
+    } catch (error) {
+      console.error("Error deleting file:", error);
+    }
+  }
+
   export async function saveWorkflow(workflow: Workflow) {
     console.log("🥳saveWorkflow", workflow);
-    const file_path = await genWorkflowAbsPath(workflow);
+    const absPath = await genWorkflowAbsPath(workflow);
     const json = workflow.json;
     const flow = JSON.parse(json);
     flow.extra[COMFYSPACE_TRACKING_FIELD_NAME] = {
       id: workflow.id,
     };
 
-    await updateFile(file_path, JSON.stringify(flow));
+    const response = await fetch("/workspace/file/save", {
+      method: "POST",
+      headers: {
+        "Content-Type": "application/json",
+      },
+      body: JSON.stringify({
+        path: absPath,
+        json: json,
+      }),
+    });
+    const result = await response.text();
+    return result;
   }
   export async function deleteWorkflow(workflow: Workflow) {
     const absPath = await genWorkflowAbsPath(workflow);
@@ -234,6 +276,8 @@ export type ScanLocalFile = {
   name: string;
   id: string;
   json: string;
+  createTime: number;
+  updateTime: number;
 };
 export type ScanLocalFolder = {
   type: "folder";
diff --git a/ui/src/components/EditFlowName.tsx b/ui/src/components/EditFlowName.tsx
index aa025d0..5033b3f 100644
--- a/ui/src/components/EditFlowName.tsx
+++ b/ui/src/components/EditFlowName.tsx
@@ -61,7 +61,7 @@ export default function EditFlowName({
           "The name is duplicated, please modify it and submit again.",
         );
       } else {
-        await workflowsTable?.updateFlow(curFlowID, {
+        await workflowsTable?.updateName(curFlowID, {
           name: trimEditName,
         });
         updateFlowName(trimEditName);
diff --git a/ui/src/components/VersionHistoryDrawer.tsx b/ui/src/components/VersionHistoryDrawer.tsx
index d65e1c4..4c2b16a 100644
--- a/ui/src/components/VersionHistoryDrawer.tsx
+++ b/ui/src/components/VersionHistoryDrawer.tsx
@@ -147,7 +147,6 @@ export function VersionHistoryDrawer({ onClose }: { onClose: () => void }) {
                             }
                             app.loadGraphData(JSON.parse(version.json));
                             workflowsTable?.updateFlow(curFlowID!, {
-                              lastSavedJson: version.json,
                               json: version.json,
                             });
                             toast({
@@ -191,7 +190,7 @@ export function VersionHistoryDrawer({ onClose }: { onClose: () => void }) {
                         }
                         app.loadGraphData(JSON.parse(c.json));
                         workflowsTable?.updateFlow(curFlowID!, {
-                          lastSavedJson: c.json,
+                          json: c.json,
                         });
                         onClose();
                       }}
diff --git a/ui/src/db-tables/DiskFileUtils.ts b/ui/src/db-tables/DiskFileUtils.ts
index 899720f..69c9a9c 100644
--- a/ui/src/db-tables/DiskFileUtils.ts
+++ b/ui/src/db-tables/DiskFileUtils.ts
@@ -9,7 +9,7 @@ import { Workflow } from "../types/dbTypes";
 import { TwowayFolderSyncAPI } from "../apis/TwowaySyncFolderApi";
 
 export async function saveJsonFileMyWorkflows(workflow: Workflow) {
-  console.log("saveJsonFileMyWorkflows", workflow);
+  console.warn("saveJsonFileMyWorkflows", workflow);
   const file_path = await generateFilePath(workflow);
   if (file_path == null) {
     return;
diff --git a/ui/src/db-tables/FoldersTable.ts b/ui/src/db-tables/FoldersTable.ts
index c2ebba0..2814218 100644
--- a/ui/src/db-tables/FoldersTable.ts
+++ b/ui/src/db-tables/FoldersTable.ts
@@ -112,7 +112,7 @@ export class FoldersTable extends TableBase<Folder> {
                 await workflowsTable?.deleteFlow(flow.id);
                 break;
               case EFlowOperationType.MOVE_TO_ROOT_FOLDER:
-                await workflowsTable?.updateFlow(flow.id, {
+                await workflowsTable?.updateFolder(flow.id, {
                   parentFolderID: undefined,
                 });
                 break;
diff --git a/ui/src/db-tables/MediaTable.ts b/ui/src/db-tables/MediaTable.ts
index 5fdbd0a..d15cf18 100644
--- a/ui/src/db-tables/MediaTable.ts
+++ b/ui/src/db-tables/MediaTable.ts
@@ -34,7 +34,7 @@ export class MediaTable extends TableBase<Media> {
     //link media to workflow
     const workflow = await workflowsTable?.get(input.workflowID);
     const newMedia = new Set(workflow?.mediaIDs ?? []).add(md.id);
-    await workflowsTable?.updateFlow(input.workflowID, {
+    await workflowsTable?.updateMetaInfo(input.workflowID, {
       mediaIDs: Array.from(newMedia),
       coverMediaPath: md.localPath,
     });
diff --git a/ui/src/db-tables/WorkflowsTable.ts b/ui/src/db-tables/WorkflowsTable.ts
index afaa44f..ccb76fb 100644
--- a/ui/src/db-tables/WorkflowsTable.ts
+++ b/ui/src/db-tables/WorkflowsTable.ts
@@ -131,79 +131,69 @@ export class WorkflowsTable extends TableBase<Workflow> {
   ): Promise<Workflow | null> {
     throw new Error("Method not allowed.");
   }
+
   public async updateMetaInfo(
     id: string,
     change: Omit<Partial<Workflow>, "id" | "name" | "parentFolderID" | "json">,
   ): Promise<Workflow | null> {
     //update indexdb
     await indexdb.workflows.update(id, change);
-    const newWorkflow = (await this.get(id, false)) ?? null;
+    const newWorkflow = (await indexdb.workflows.get(id)) ?? null;
     //update curWorkflow RAM
     if (this._curWorkflow && this._curWorkflow.id === id) {
       this._curWorkflow = newWorkflow;
     }
-    await this.saveDiskDB();
+    this.saveDiskDB();
     return newWorkflow;
   }
 
-  public async updateFlow(id: string, input: Partial<Workflow>) {
-    // console.log("updateFlow", id, input);
-    const before = await this.get(id);
-    if (before == null) {
+  async updateFolder(id: string, change: Pick<Workflow, "parentFolderID">) {
+    const twoWaySyncEnabled = await userSettingsTable?.getSetting("twoWaySync");
+    const oldWorkflow = await this.get(id);
+    const newWorkflow = await this.updateMetaInfo(id, change as any);
+    if (!newWorkflow || !oldWorkflow) {
       return;
     }
-    const after = {
-      ...before,
-      ...input,
-      id,
-    };
-    const beforeStr = JSON.stringify(before);
-    const afterStr = JSON.stringify(after);
-    if (beforeStr === afterStr) {
-      // no change detected
-      return;
-    }
-    const newWorkflow: Workflow = after;
-    // When modifying the associated tag or modifying the directory, updateTime is not modified.
-    const updateKey = Object.keys(input);
-    const isModifyingTagOrFolder =
-      updateKey.length === 1 &&
-      ["tags", "parentFolderID"].includes(updateKey[0]);
-    if (!isModifyingTagOrFolder) {
-      newWorkflow.updateTime = Date.now();
+    if (twoWaySyncEnabled) {
+      await TwowaySyncAPI.moveWorkflow(oldWorkflow, change.parentFolderID!);
+    } else {
+      await saveJsonFileMyWorkflows(newWorkflow);
+      await deleteJsonFileMyWorkflows(oldWorkflow);
       // update parent folder updateTime
-      if (newWorkflow.parentFolderID != null) {
-        await foldersTable?.update(newWorkflow.parentFolderID, {
+      if (newWorkflow?.parentFolderID != null) {
+        await indexdb.folders?.update(newWorkflow.parentFolderID, {
           updateTime: Date.now(),
         });
       }
     }
-    //update indexdb
-    await indexdb.workflows.update(id, newWorkflow);
-    //update curWorkflow RAM
-    if (this._curWorkflow && this._curWorkflow.id === id) {
-      this._curWorkflow = newWorkflow;
+  }
+  public async updateName(id: string, change: Pick<Workflow, "name">) {
+    const before = await this.get(id);
+    const twoWaySyncEnabled = await userSettingsTable?.getSetting("twoWaySync");
+    if (twoWaySyncEnabled) {
+      before &&
+        (await TwowaySyncAPI.renameWorkflow(before, change.name + ".json"));
     }
-    await this.saveDiskDB();
-    // save to my_workflows/
-    if ("name" in input || "parentFolderID" in input) {
-      const twoWaySyncEnabled =
-        await userSettingsTable?.getSetting("twoWaySync");
-      // renamed file or moved file folder
-      if (twoWaySyncEnabled) {
-        if ("name" in input) {
-          await TwowaySyncAPI.renameWorkflow(before, input["name"]! + ".json");
-        } else if ("parentFolderID" in input) {
-          await TwowaySyncAPI.moveWorkflow(before, input["parentFolderID"]!);
-        }
-      } else {
-        await saveJsonFileMyWorkflows(after);
-        await deleteJsonFileMyWorkflows(before);
-      }
+  }
+  public async updateFlow(id: string, input: Pick<Workflow, "json">) {
+    const before = await this.get(id);
+    if (before == null) {
       return;
     }
-    if (input.json != null) {
-      await saveJsonFileMyWorkflows(after);
+    const beforeStr = JSON.stringify(before.json);
+    const afterStr = JSON.stringify(input.json);
+    if (beforeStr === afterStr) {
+      // no change detected
+      return;
+    }
+    console.log("updateFlow", id, input);
+    const after = await this.updateMetaInfo(id, input as any);
+    // save to my_workflows/
+    const twoWaySyncEnabled = await userSettingsTable?.getSetting("twoWaySync");
+    if (twoWaySyncEnabled) {
+      after && TwowaySyncAPI.saveWorkflow(after);
+    } else {
+      after && (await saveJsonFileMyWorkflows(after));
     }
   }
 
@@ -239,7 +229,13 @@ export class WorkflowsTable extends TableBase<Workflow> {
         tags: [],
       };
       newWorkflows.push(newWorkflow);
-      await saveJsonFileMyWorkflows(newWorkflow);
+      const twoWaySyncEnabled =
+        await userSettingsTable?.getSetting("twoWaySync");
+      if (twoWaySyncEnabled) {
+        TwowaySyncAPI.creatWorkflow(newWorkflow);
+      } else {
+        await saveJsonFileMyWorkflows(newWorkflow);
+      }
     }
     await indexdb.workflows.bulkAdd(newWorkflows);
     this.saveDiskDB();
diff --git a/ui/src/gallery/components/GalleryMediaItem.tsx b/ui/src/gallery/components/GalleryMediaItem.tsx
index 2f55b29..2a09f06 100644
--- a/ui/src/gallery/components/GalleryMediaItem.tsx
+++ b/ui/src/gallery/components/GalleryMediaItem.tsx
@@ -91,7 +91,7 @@ const GalleryMediaItem: React.FC<GalleryMediaItemProps> = ({
             icon={isCover ? <IconPinFilled size={19} /> : <IconPin size={19} />}
             aria-label="set as cover"
             onClick={() => {
-              workflowsTable?.updateFlow(curFlowID, {
+              workflowsTable?.updateMetaInfo(curFlowID, {
                 coverMediaPath: media.localPath,
               });
               setCoverPath(media.localPath);
@@ -147,7 +147,7 @@ const GalleryMediaItem: React.FC<GalleryMediaItemProps> = ({
               if (!res) return;
               await mediaTable?.delete(media.id);
               if (isCover) {
-                await workflowsTable?.updateFlow(curFlowID, {
+                await workflowsTable?.updateMetaInfo(curFlowID, {
                   coverMediaPath: undefined,
                 });
                 setCoverPath("");
diff --git a/ui/src/share/ShareDialog.tsx b/ui/src/share/ShareDialog.tsx
index 8fed848..b2b5d6f 100644
--- a/ui/src/share/ShareDialog.tsx
+++ b/ui/src/share/ShareDialog.tsx
@@ -73,7 +73,7 @@ export default function ShareDialog({ onClose }: Props) {
 
     cloudID &&
       localID &&
-      (await workflowsTable?.updateFlow(localID, {
+      (await workflowsTable?.updateMetaInfo(localID, {
         cloudID: cloudID,
         cloudURL: cloudHostRef.current + "/workflow/" + cloudID,
       }));