For me the solution was about the path.
Looking at the ‘Store uploads in this folder’ path it was showing my full server file system path: /www/domainname.com/…
Changing that to wp-content/uploads works fine.
Also copying the content from a terminal path on the server fixes it and goes back to the short version: wp-content/uploads. This makes me think there was an error in there before but it’s changed and working now so I can’t say what it was or why.
