I just got an FTP increase (go me), and took a screenshot by pressing F10 (as Companion won’t take one).
The other screenshots I took were available for upload to my activity, but the FTP one wasn’t one of them.
That seems like a bug to me. They used to be available for selection I’m sure.
Or am I mistaken and it’ll only offer the first 5 images for upload? The screenshot was the 6th.