If you run out of your Fotor cloud storage, you can either upgrade to Fotor Pro or Pro+ to get more space or simply free up storage by deleting content that you're not using.
First, login to Fotor website and you will see "My Projects" and "Uploads" on the left menu. See as below:
Then, you can tick the content you'd like to delete and click on the "Move to trash" button at the bottom.