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You need to delete the submissions that has the attachments or uploaded files. Here's a guide on how to delete submissions:
1. In My Forms, select the form and then click the "Submissions" button.
2. In the Submissions page, you can click the "Delete" button in order to delete the submission.
If you scroll down, you'll see the Grid Report. Here there is a button to delete the submission as well. You also have an option to "Delete All Submissions", just click the button in the right side.
Let us know if you need further help. Thank you.