Source detection
Images are tagged automatically as ComfyUI, Midjourney, Stable Diffusion, or Generic based on embedded metadata.
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Documentation · How-to
Point Numonic at any folder on your computer and new AI-generated images are imported automatically with full metadata extraction. Six steps below to set it up, plus troubleshooting and FAQ.
You will learn how to: connect a folder · grant permission · review the Import Preview · install Numonic as a PWA · fix common reconnection issues.
You can complete every step below in under five minutes on a supported browser (Chrome 86+ or Edge 86+ on desktop). Steps 5 and 6 happen automatically once the folder is connected.
Folder Sync runs inside your Numonic library — first create a free account or sign in to an existing one. Folder Sync is available on all tiers, including free.
Once signed in, open the Import page from the left sidebar (or visit /app/import directly). This is the hub for all asset ingestion.
Click the Connect Your First Folder button. Your browser will open a folder picker — choose any local directory you want Numonic to watch (your ComfyUI output folder, your Midjourney Downloads folder, a Stable Diffusion outputs folder, or any creative workspace).
Your browser will ask permission to read the folder. Click View files (Chrome / Edge) to grant access. Numonic only reads — your local files are never modified, moved, or deleted.
If the folder already contains files, an Import Preview appears automatically. Numonic detects what tools generated the assets (ComfyUI, Midjourney, Stable Diffusion, Generic) and lets you choose what to import. Click Import All or pick a subset.
From now on, any new files saved to the folder are detected and uploaded automatically with full metadata extraction. Folder Sync runs while Numonic is open in a browser tab; close the tab and sync pauses until you reopen it. Supported formats: PNG, JPG, WebP, GIF, MP4, WebM, MOV, and ZIP archives.
Once a folder is connected (steps 1–6 above), Numonic applies the following automatically to every file that arrives. To disable per-tool detection for faster bulk imports, toggle off Smart Import in the folder's settings on the Import page.
Images are tagged automatically as ComfyUI, Midjourney, Stable Diffusion, or Generic based on embedded metadata.
Subfolders in the watched folder become collections in Numonic, preserving your organisation.
Drop a ZIP (e.g., Midjourney "Download All") and Numonic extracts, source-detects, and imports each image individually. Up to 1.1 GB per ZIP.
Already-imported files are skipped automatically. The watcher tracks seen files via IndexedDB and remembers across sessions.
Folder Sync uses the File System Access API. Detection latency depends on browser version.
Real-time detection via FileSystemObserver API. New images are uploaded within seconds of being saved.
Periodic polling every 5 seconds. Reliable but slightly delayed compared to real-time detection.
Not supported — File System Access API is not implemented. Use Chrome or Edge for folder watching; manual upload still works.
Installing Numonic as a Progressive Web App gives you a dedicated window, quick launch from dock/Start menu, and (on Chrome 122+) better folder-permission persistence between sessions.
To uninstall: visit chrome://apps, right-click Numonic → Remove.
To uninstall: visit edge://apps, right-click Numonic → Uninstall.
Common issues with concrete fixes. Each entry explains why it happens and exactly what to click.
Why it happens: Browser file system permissions are revoked when you close the browser. They don't persist across sessions for security reasons.
Why it happens: Chromium-based browsers (Chrome, Edge, Brave) block web apps from accessing certain top-level folders to protect your system. Blocked locations include Desktop, Downloads, Documents (top-level), your home directory (~), Applications, Library (Mac), AppData, and Program Files (Windows).
Downloads/midjourney-images instead of Downloads, or create a dedicated folder like ComfyUI-Output and select that. This restriction is a browser security feature and cannot be bypassed.Why it happens: Supported file types are PNG, JPG, WebP, GIF, MP4, WebM, MOV, and ZIP. Other types are ignored.
Why it happens: Folder configurations are shared between Chromium-based browsers (Chrome/Edge/Brave share storage), but file access permissions are browser-specific and can't be transferred for security reasons.
Why it happens: You're using a browser that doesn't support the File System Access API (Firefox, Safari, or any mobile browser).
Questions we get most often from prospects evaluating Folder Sync before signing up.