Dear,
I have the same problem:
My medialibrary (in dashboard) shows all uploaded pictures, video’s, etcetera. But when i want to add a mediafile to a post or page, the newest uploaded files seem to be missing. Again, they are still in my medialibrary in the wordpressdashboard.
I’m no expert in building websites: https://www.emclogics.com, but i need to fix this issue. Is there anybody that can help me?
What i did:
Deactivate all plugins,
Back to default theme
Hotfix (plugin)
check ftp-server (media is there)