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I did check your account and found that you have only received 7 submissions but have received 80 uploaded files which is approx 71.27 MB. That is the reason why your account is almost out of space as in free account you can only receive up to 100 MB of uploads.
To free up your upload storage space, you should delete your submission records which has file attachment. Deleting a submission record will also delete the attached file as well resulting in freeing up your upload storage space.
Hope this helps.
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