Known issues and their solutions:
Internal error If this error persists for more than an hour and uploading/submitting files manually on the agency website works fine - please contact our support.
Subscription problem on VectorStock You have used all of your submissions to VectorStock. It is not possible to upload files to this agency without submitting them immediately so if you don’t have any available submissions M+ won’t be able to upload files there either. To solve this issue please purchase one of the packages or wait for the next 30-days period and then try again (change the status for VectorStock to Ready and launch the uploading again).