I also would like this feature very much. That's exactly my use case, to spare only posts with attachments and nothing else.

Can attachments be matched in a regex somehow, I wonder?

I want to be able to only delete messages that don't have links/attachments/pinned.

Right now I can only delete those messages. Any way to crate an inverse rule to keep those messages?

I got it working. Comment out the line that has ['has', this.options.hasFile ? 'file' : undefined], which is line 664 for me in the current script.

Then add the following after the filter for pinned messages. I have it at line 735.

        if (this.options.hasFile) {
          messagesToDelete = messagesToDelete.filter(msg => !msg.attachments || msg.attachments.length === 0);
        }

After this, ticking HAS: FILE will spare messages with attachments and delete all others.

Added.

📥 CLICK HERE TO INSTALL v5.3.2

📝 Changelog: Undiscord v5.3.2 - The "Media Manager" Update

🔥 New Features

• Interactive Media Scanner (Media Mode):

  • Added a dedicated mode to scan all media to backup/keep/delete.
  • Pauses execution to present a Visual Grid of found media to download before deletion, or keeping it in discord without deletion (just backup.)

• Smart Backup System:

  • Integrated GM_download to auto-save files to your local drive.
  • Dynamic Folder Structure: Automatically organizes downloads into \User\Server Name\Channel Name\.
  • Advanced Logic: Added 12 different action combinations (e.g., Backup & Keep All, Backup Selected & Delete Others, Delete Selected Only, etc.).

• Inverse Filters: Added "Skip" options to the main filter list (Skip Links, Skip Files, Skip Pinned).

✨ UI & UX Improvements

• Cyberpunk Interface:
  • Added a sleek, resizable Dark Mode Modal for media selection.
  • Implemented Neon/Glowing Buttons for high visibility.
  • Added File Type Badges (PNG, MP4, TXT) and Video Previews (hover to play) on thumbnails.
• Context Awareness: Added a "Jump to Message" (🔗) link on every thumbnail to view the context in a new tab.
• Feedback Loops: Added detailed logs for download progress and "Cooling Down" timers so the script never looks frozen.

⚙️ Core Logic & Fixes

• Pagination Overhaul: Switched from offset based searching to ID-based Pagination (max_id). This completely fixes the "Infinite Loop" bug where kept messages were re-scanned endlessly.
• Crash Protection:
  • Added robust handling for 401/403 Errors (Missing Access) to prevent script crashes on locked channels.
  • Fixed the "Batch Stop" logic so finishing one channel doesn't abort the entire queue.
• Title Parsing: Rewrote the browser title parser to accurately extract Server and Channel names.