What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
Limit-wise, nothing will change. You're still limited to just 100MB of Upload Space storage regardless if you integrate with 3rd party storage platforms or not.
All File Uploads done on your forms will be stored on your account. If you integrated with Dropbox/Drive, then those files will be saved there too.
Should you aim to free up more space, all you have to do is delete submissions with associated file uploads. Just keep 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.
Related guide: How-to-Delete-Form-Submission-Data
If you're on a higher tier plan where you have GB's of Upload Space, then what you need to take note of would be the limits per platform (limits with Dropbox and Google Drive). We discussed this in full detail on the guide I'm linking below.
Complete guide: Changing-the-File-Upload-Size-Limit