1.14.0
release were accidentally encrypted twice. Media backup, file/folder standard (and drag&drop) upload weren't affected.
This was patched in the 1.14.3
release, but entries created since: 1.14.0
remain unreadable and need to be deleted.
Are you referring to files uploaded recently which may be affected by the issue I've just mentioned or perhaps your files were uploaded in a distant past? (edited)