I just wanted to keep this thread alive, a client of ours is experiencing the same issue. The weird thing is that you can see the uploaded file just fine if you are on the “List” view in the Media library, but not in the “Grid” view. But yes it has something to do with the ‘basic’ upload type in acf_form.
Also, just for reference I am on the latest WP version (4.9.5) – I have a feeling it broke in either this version or 4.9.4, seeing as it seemed to become an issue right around beginning of April.
