diff --git a/Figure1.png b/Figure1.png
new file mode 100644
index 0000000..89da1c6
Binary files /dev/null and b/Figure1.png differ
diff --git a/Figure2.png b/Figure2.png
new file mode 100644
index 0000000..1f0fe04
Binary files /dev/null and b/Figure2.png differ
diff --git a/README.md b/README.md
index 30cbc3c..8ad328c 100644
--- a/README.md
+++ b/README.md
@@ -32,6 +32,12 @@ git clone https://github.com/XuanYu-github/comfyui-PlyPreview.git
 2) 连接 Preview Gaussian，执行后 iframe 显示控制条（Scale、Reset View、Screenshot）和信息面板。
 3) 若启用透明度过滤，会在源旁生成 `_opacity{threshold}.ply`。
 
+示例：
+
+![Sharp → PlyPreview 工作流示例](Figure1.png)
+
+![加载与刷新 PLY 列表示例](Figure2.png)
+
 ## 依赖
 - ComfyUI（默认已启用 DOM widgets）。
 - Python：`plyfile`、`numpy`（缺失时 `pip install plyfile numpy`）。
diff --git a/__init__.py b/__init__.py
index 68a9b76..a974be3 100644
--- a/__init__.py
+++ b/__init__.py
@@ -7,6 +7,13 @@ from .load_gaussian_ply import LoadGaussianPLY
 from .load_gaussian_ply_path import LoadGaussianPLYPath
 from .process_gaussian_ply import ProcessGaussianPLY
 from .preview_gaussian import PreviewGaussianNode
+from aiohttp import web
+
+try:
+    from server import PromptServer
+except Exception as e:  # pragma: no cover - ComfyUI runtime only
+    PromptServer = None
+    print(f"[PlyPreview] Warning: server import failed: {e}")
 
 WEB_DIRECTORY = "web"
 
@@ -24,6 +31,18 @@ NODE_DISPLAY_NAME_MAPPINGS = {
     "PlyPreviewPreviewGaussianEnhance": "Preview Gaussian Enhance",
 }
 
+# Lightweight API to let the frontend refresh PLY dropdowns without restarting ComfyUI
+if PromptServer is not None:
+    async def plypreview_list_ply_files(request):  # pragma: no cover - runtime route
+        files = LoadGaussianPLY._get_ply_files()
+        return web.json_response({"files": files})
+
+    try:
+        PromptServer.instance.routes.get("/plypreview/files")(plypreview_list_ply_files)
+        print("[PlyPreview] Registered /plypreview/files refresh endpoint")
+    except Exception as e:  # pragma: no cover
+        print(f"[PlyPreview] Warning: failed to register refresh endpoint: {e}")
+
 __all__ = [
     "NODE_CLASS_MAPPINGS",
     "NODE_DISPLAY_NAME_MAPPINGS",
diff --git a/web/js/gaussian_preview.js b/web/js/gaussian_preview.js
index 3ddb4b5..d71ffb7 100644
--- a/web/js/gaussian_preview.js
+++ b/web/js/gaussian_preview.js
@@ -4,6 +4,7 @@
  */
 
 import { app } from "../../../scripts/app.js";
+import { api } from "../../../scripts/api.js";
 
 // Auto-detect extension folder name (handles comfyui-PlyPreview or other folder names)
 const EXTENSION_FOLDER = (() => {
@@ -18,6 +19,43 @@ app.registerExtension({
     name: "plypreview.gaussianpreview",
 
     async beforeRegisterNodeDef(nodeType, nodeData, app) {
+        // Auto-refresh PLY dropdown list for the file selector node
+        if (nodeData.name === "PlyPreviewLoadGaussianPLYEnhance") {
+            const onNodeCreated = nodeType.prototype.onNodeCreated;
+            nodeType.prototype.onNodeCreated = function() {
+                const r = onNodeCreated ? onNodeCreated.apply(this, arguments) : undefined;
+
+                const widget = (this.widgets || []).find(w => w.name === "ply_file");
+
+                const refreshList = async () => {
+                    try {
+                        const resp = await api.fetchApi("/plypreview/files");
+                        const json = await resp.json();
+                        const files = Array.isArray(json.files) && json.files.length > 0 ? json.files : ["No PLY files found"];
+                        if (widget) {
+                            widget.options.values = files;
+                            widget.value = files[0];
+                            this.setDirtyCanvas(true);
+                            app.graph.setDirtyCanvas(true, true);
+                        }
+                    } catch (e) {
+                        console.warn("[PlyPreview] Failed to refresh PLY list", e);
+                    }
+                };
+
+                this.refreshPlyList = refreshList;
+                refreshList();
+
+                // Add in-node refresh button instead of relying on context menu
+                this.addWidget("button", "Refresh PLY list", () => this.refreshPlyList && this.refreshPlyList(), {
+                    serialize: false,
+                    width: 180,
+                });
+
+                return r;
+            };
+        }
+
         if (nodeData.name === "PlyPreviewPreviewGaussianEnhance") {
             console.log("[PlyPreview Gaussian] Registering Preview Gaussian Enhance node");
 
diff --git a/web/viewer_gaussian.html b/web/viewer_gaussian.html
index ba04fce..faca78a 100644
--- a/web/viewer_gaussian.html
+++ b/web/viewer_gaussian.html
@@ -143,6 +143,12 @@
         const infoPanel = document.getElementById('infoPanel');
         const infoContent = document.getElementById('infoContent');
 
+        // Make canvas focusable so keyboard controls (WASD/arrows) work after clicking the viewer
+        canvas.tabIndex = 0;
+        canvas.style.outline = "none";
+        const focusCanvas = () => canvas.focus({ preventScroll: true });
+        canvas.addEventListener('pointerdown', focusCanvas);
+
         // gsplat.js components
         let scene = null;
         let camera = null;