I have tried to upload a 77 MB file on Wikimedia Commons 2 or 3 times yesterday night and 2 or 3 times today again. Each time 100% of the file seems to upload, but at the end I obtain the "Sorry! We could not process your edit due to a loss of session data. Please try again. If it still does not work, try logging out and logging back in." message.
These attempts were made using Firefox 7, except the last one which was made using Chrome 9.0.
Uploading this file takes 1 hour and 20 minutes from my computer. I have already spent 5 or 6 hours for this upload only, without success. Is there anything I can do ?
Yesterday morning, I uploaded another file which was 78 MB and it was OK from the first time.