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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I suggest you to read our essential guide here on Upload Limits. Here is the quick overview;
Google Doc Format = 2MB or less
Google Spreadsheet Format = 20MB or less
Google Presentations Format = 50MB or less
For other formats on Google Drive = 10GB or less
I hope this helps. Please let us know if you need further assistance on this, we would be happy to assist you.