What is max file upload size and number of uploads?

Since you are on a free account, your upload storage limit is 100MB, see our pricing page for details https://www.jotform.com/pricing.

If you are referring to the file upload field,

You can define the allowed max file size in your upload field as well as the max number of files can be uploaded per submission.

Right click the field > Edit properties if you want to set a maximum number of files to be uploaded when allow multiple is enabled.