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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Yes, there is a file size limit imposed with the Dropbox Integration. Please note this isn't something we impose, it's just due to the API constraints with Dropbox Integration. Individual max file size is 300mb, anything above that will not be forwarded to Dropbox but you can download them from your JotForm storage. Also, this is a limit per file not per form, so you can essentially have multiple file upload fields on your form and have them forward the files to Dropbox.
Here's a page detailing the list of upload size limits as stated on Dropbox's & Google Drive's official pages. Hope that answered your question.
Does the attached file size count towards the jotform monthly allowance?
Any file uploaded through your form will count in the Upload Space limit.
Please note that this limit does not reset. So if you reach your limit, you may consider upgrading to a paid plan the best suits your upload needs, otherwise, you will need to delete submission that contain uploaded files to free up space.
Let us know if you have more questions.