This page explains how to take a file out of a collection by deleting it from that collection. Deleting permanently removes the selected documents. It is not the same as unlinking a whole collection from an assistant.
Delete documents in the collection
Open Knowledge bases and open the collection.
Select the documents to remove.
Confirm Delete selected documents.
Choose Sync collection so assistants stop using those files. If you leave without syncing, the change is not fully applied.
You must keep at least one document in the collection: Raison blocks deleting the last one.
Remove a file from a failed review
If the file failed to process, the collection review also offers Remove on that card. See When a resource fails to process.
Unlink a collection from an assistant
Unlinking a collection from an assistant is a different action, and you cannot remove the last collection. You do this from the assistant's collections, not from the collection itself.
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