If you haven't already, update to version 3.14.0 | 3.2.0 or higher.
To update, look for the green arrow on your Medal app. (If you're having trouble updating make a support ticket and we can help you out -> New Support Ticket)
In this new update, we have a REPAIR option available. This new option can fix a ton of different issues. Try using the repair button if you are having trouble uploading.