One of the reasons for a Wrong Format error with CC Libraries is a sync error. If these are the same files that used to work, and you say they are a 'total mess' then a sync error sounds like a strong possibility.
This is what the Google Ai summery suggests. (Or try this link)
1. Verify Supported File Formats
First, confirm the file type you are trying to add is supported by Creative Cloud Libraries. Common supported formats include AI, PNG, BMP, PSD, SVG, GIF, JPG, TIF, PDF, and HEIC. If the file is an obscure or application-specific format (like .mxf or certain specialized video formats), it might not be compatible.
2. Troubleshoot Sync Issues and Relaunch Processes
Sync errors are a common cause of generic "wrong format" messages.
Relaunch the CCLibrary process: Use a keyboard shortcut to restart the core Creative Cloud processes.
Windows: Press Ctrl + Alt + R .
Mac OS: Press Command + Option + R .
After the Creative Cloud app relaunches, restart the specific Adobe product (e.g., Photoshop, Illustrator) you were using.
Check your internet connection: Ensure your internet connection is stable. Intermittent connections can cause files to download or sync improperly, leading to corrupted data that the app cannot read.
3. Clear the Creative Cloud Libraries Cache
If relaunching doesn't work, clearing the local cache forces the application to re-download the library assets cleanly.
Close all Adobe applications.
Sign out of the Creative Cloud desktop app.
Navigate to the following folder location (you may need to show hidden files/folders):
Windows: C:\Users\<username>\AppData\Roaming\Adobe\Creative Cloud Libraries
Mac OS: /Users/<username>/Library/Application Support/Adobe/Creative Cloud Libraries
Move all the files/folders within the Creative Cloud Libraries directory to another temporary location (e.g., your desktop) as a backup.
Restart your computer and log back into the Creative Cloud desktop app. The libraries should re-initialize and sync correctly.
4. Use the Creative Cloud Cleaner Tool
If the above steps fail, you may have corrupted installation files. The official Adobe Creative Cloud Cleaner Tool can help fix stubborn installation problems by removing corrupted or problematic files.
5. Contact Adobe Support
If the problem persists, it may be a specific bug or issue related to your account or a specific file that the Adobe developers need to examine. You can share details and example files on the Adobe Community forums for further assistance.
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