There are two persistent libraries: Organization-wide (managed by admins only) and Personal (visible only to you). Chat uploads are specific to a chat and do not appear permanently in these libraries.
Organization Library
No organization documents available.
My personal library (persistent)
No personal documents available.
Only persistent uploads appear here. Chat uploads are chat-specific.
Chat uploads (active chat only)
These files are only active in the current chat context and will not be transferred to the persistent library.
No chat uploads in the active chat.