I’m experiencing the same thing in 4.6.0. When I enable “Access the Media Library” AND “Update (crop, details, replace) + delete” to users that “is creator” - the Author can only see their own uploaded media. That is correct.
However, when I enable full access to “Access the Media Library”, but keep “Update + delete” as “is creator”, all authors can see and update/delete every media entry. I thought it would let the author see everything in the Media Library, but only let them update/delete their own uploads…
Any ideas on how to achieve this?