fix: ltx latent_upscaler reads from latent_upscale_models/ folder, not upscale_models/

config_builder_node.py

@@ -1173,6 +1173,13 @@ async def get_model_lists_endpoint(request):
         except (KeyError, Exception):
             upscale_models = []
 
+        # Latent upscale model list (separate folder; used by LatentUpscaleModelLoader,
+        # e.g. LTX 2.3 spatial upscaler)
+        try:
+            latent_upscale_models = folder_paths.get_filename_list("latent_upscale_models")
+        except (KeyError, Exception):
+            latent_upscale_models = []
+
         # VAE list
         vae_list = folder_paths.get_filename_list("vae")
 
@@ -1191,6 +1198,7 @@ async def get_model_lists_endpoint(request):
             "dual_clip_types": dual_clip_types,
             "vae": vae_list,
             "upscale_models": upscale_models,
+            "latent_upscale_models": latent_upscale_models,
             "samplers": sampler_names,
             "schedulers": scheduler_names
         })

ltx_video_generation.py

@@ -153,13 +153,15 @@ def preflight_ltx(config):
         )
 
     # 3. Model files exist?
+    # Note: latent_upscaler lives in `latent_upscale_models/` (consumed by
+    # LatentUpscaleModelLoader), NOT `upscale_models/` (which is for image upscalers).
     checks = [
         ("diffusion_models", config["model"]),
         ("text_encoders", config["clip_models"][0]),
         ("text_encoders", config["clip_models"][1]),
         ("vae", config["vae_video"]),
         ("vae", config["vae_audio"]),
-        ("upscale_models", config["latent_upscaler"]),
+        ("latent_upscale_models", config["latent_upscaler"]),
     ]
     missing_files = []
     for folder_key, name in checks:

web/conf_builder/conf-builder-config-management.js

@@ -16,6 +16,7 @@ import {
     getVAEFolders,
     getAvailableTextEncoders,
     getAvailableUpscaleModels,
+    getAvailableLatentUpscaleModels,
     getAvailableSamplers
 } from './conf-builder-utilities.js';
 
@@ -3854,7 +3855,7 @@ function renderLTXModelFiles(node, configArray) {
 
     const textEncoders = getAvailableTextEncoders();
     const vaeList = getAvailableVAEs();
-    const upscaleModels = getAvailableUpscaleModels();
+    const latentUpscaleModels = getAvailableLatentUpscaleModels();
 
     const fields = [
         {label: "Dual CLIP 1 (gemma):", optionsList: textEncoders,
@@ -3881,8 +3882,8 @@ function renderLTXModelFiles(node, configArray) {
             placeholder: "Search VAEs...",
             getter: () => ltx.vae_audio || "",
             setter: (v) => { ltx.vae_audio = v; node.saveState(); }},
-        {label: "Latent Upscaler:", optionsList: upscaleModels,
-            placeholder: "Search upscale models...",
+        {label: "Latent Upscaler:", optionsList: latentUpscaleModels,
+            placeholder: "Search latent upscalers...",
             getter: () => ltx.latent_upscaler || "",
             setter: (v) => { ltx.latent_upscaler = v; node.saveState(); }},
     ];

web/conf_builder/conf-builder-utilities.js

@@ -18,6 +18,8 @@ let availableVAEs = null;
 let vaeFolders = null;
 let availableUpscaleModels = [];
 let upscaleModelFolders = ["/"];
+let availableLatentUpscaleModels = [];
+let latentUpscaleModelFolders = ["/"];
 let clipTypes = [];
 let dualClipTypes = [];
 let availableSamplers = [];
@@ -311,6 +313,10 @@ export async function getModelLists() {
         availableUpscaleModels = (data.upscale_models || []).map(normalizePath);
         upscaleModelFolders = extractFolders(availableUpscaleModels);
 
+        // Latent upscale model list (separate folder; LTX 2.3 spatial upscaler etc.)
+        availableLatentUpscaleModels = (data.latent_upscale_models || []).map(normalizePath);
+        latentUpscaleModelFolders = extractFolders(availableLatentUpscaleModels);
+
         console.log(`[ConfigBuilder] Model lists loaded: ${availableModels?.length || 0} checkpoints, ` +
             `${availableDiffusionModels.length} diffusion models, ${availableGGUFModels.length} GGUFs, ` +
             `${availableTextEncoders.length} text encoders, ${availableVAEs.length} VAEs, ` +
@@ -346,6 +352,8 @@ export function getAvailableSamplers() { return availableSamplers || []; }
 export function getAvailableSchedulers() { return availableSchedulers || []; }
 export function getAvailableUpscaleModels() { return availableUpscaleModels || []; }
 export function getUpscaleModelFolders() { return upscaleModelFolders || ["/"]; }
+export function getAvailableLatentUpscaleModels() { return availableLatentUpscaleModels || []; }
+export function getLatentUpscaleModelFolders() { return latentUpscaleModelFolders || ["/"]; }
 
 export async function getAvailableSessions() {
     // Return cached sessions if already loaded (cleared by clearAllCaches on explicit refresh)