JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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.
Yes, these 100Mb available space are for you to receive and save your submissions in your Jotform account. So if someone sends you a file of 30Mb, you will only have more 70 Mb until you delete that submission(s).
Please make sure you don't exceed this limit as it may result in the disabling of your forms due to overlimit reasons, until you free up some space.
Let us know if you need more assistance.