JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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If you checked the JotForm Priciing page here, you will see Bronze plan.
PREMIUM was previous name of Bronze plan in the old pricing plans.
Since your account was a grandfathered account, it retains the pricing of the PREMIUM plan while it is on the Bronze package level at this time.
Here is also the related user guide for reference: Changing-the-Upload-Size-Limit
Hope this help. Let us know if you need further assistance.