Where can I check my current Upload Space usage?

can I clean my space? to storage more submissions?

tks

You can track your usage by going to your Account's Usage page https://www.jotform.com/myaccount/usage From there, you'd see your Upload Space total.

And yes, you may free up some space by deleting Submissions. Deleting Submissions will also delete the associated file uploads in it.

Just bear in mind that when deleting submissions, you will see this warning message (see screenshot below). Please note that deleting submission data is irreversible and will permanently remove it in our servers, including the file uploads on them.

Complete guide: How-to-Delete-Form-Submission-Data