Hi,
I need a bit more information for this, as in wordpress there are no media attachment restrictions by default.
– Do the users should have access to a specific set of attachments only?
– How is this restriction implemented? (plugin, custom code, theme etc..)
– Is there an API documentation to a function to programmatically check if a user has access to a specific document?
With an API I should be able to recommend a possible custom code to remove matches to which the user does not have access to.