Available in Salesforce Classic
The Data Loader can be used to bulk transfer Content and Files to a Library.
Note: This process does not remove the Document(s) from the Library it was copied from.
The above article is only relevant for files with a ContentDocument record (For example, files added via Chatter, Files, and Content).
If the files currently exist as Documents, they need to be converted into ContentDocuments (or Files) before they can be moved to Libraries.
See also
000385550

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