It's a wiki that supports attachments, not a document or source control repository.
I'd have a look at the add-ons that add document management and/or tracking to Confluence - there's one by Arsenale which does this sort of stuff well from memory.
We are users (customers) of Arsenale Lockpoint, I can vouch that it's very good and is worth the small investment. It will even tell you who has it checked out and you can ask it to 'ping' you when it's been checked back in.
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