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.
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20MB is the max size permitted on the widget, I will forward the request to be able to go higher than 20MB. Meanwhile you could try using the File Upload field.
The Max File Size is 1GB(1048576KB):
If the request to go higher on the Drag and Drop Upload widget is approved, you will be notified via this thread about any updates.
I am currently using the File Upload feature now. I am just trying to find a way that is easier (yes, some of my clients get confused) to do it.