After much trial and error, we found that the "screenshot" upload was the culprit; it breaks the project submission (leaving dead links in a half-subscribed project, eg https://mloss.org/software/view/481/). Even though the website accepts properly sized PNG files, uploading one of these prevents the submission from going live. We did not try JPG or similar, but we did manage to upload the project after removing the screenshot altogether. We regret that there is no screenshot associated with our submission, but it seems to cause significant trouble (see our ~8 failed uploads, all various attempts of trial and error).
From John Cunningham
After much trial and error, we found that the "screenshot" upload was the culprit; it breaks the project submission (leaving dead links in a half-subscribed project, eg https://mloss.org/software/view/481/). Even though the website accepts properly sized PNG files, uploading one of these prevents the submission from going live. We did not try JPG or similar, but we did manage to upload the project after removing the screenshot altogether. We regret that there is no screenshot associated with our submission, but it seems to cause significant trouble (see our ~8 failed uploads, all various attempts of trial and error).
From John Cunningham