Previously, the process for submitting Premium Content required you to submit the "preview" file as a deviation, go through the submission process, and then attach the Premium Content by uploading files from your computer.
We just upgraded the Premium Content submission process to allow you to attach Premium Content files from your Sta.sh.
On the Sta.sh submission process, click "Attach Content from your Sta.sh":
Then, attach content from your Sta.sh or upload files from your computer:
This feature will be rolling out to deviants who have the ability to sell Premium Content over the next several hours. During this period, you may experience some hiccups with the Premium Content feature as we transition to the new system.
The Premium Content Platform is currently in BETA, but will be open for all users in the future. Read more.