@9o96o Yes, you can
Have you completed all the steps in the outgoing swap process? It's important to make sure all the statuses have been checked off.
After completing the steps you will be directed to:
When using a mobile device, you may need to scroll down to view all the information. (Please ignore the text in Dutch it's due to my browser settings.)
To add any photos, you can do so in this section. Finally, click the [Confirm mark as shipped] button at the bottom of the page.