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I have checked and your account is in good shape. You have only used 2.33 GB of 10 GB. You can check your account usage and limits on Usage page of your account.
Did you maybe deleted some submissions and cleared your upload storage space?
To clear upload storage space you will need to delete submissions that have uploaded files. Inside of this guide you can find how to do it:
Please take note: Delete submissions are permanently deleted and can no longer be restored.
I would suggest you to first download your files to your computer and then delete them.
Let us know if you need further assistance.