Currently, the 'File Upload' field has a maximum upload capacity of 25MB data upload per Form. This is a limitation of the browser to prevent timeouts so your total uploads cannot exceed 25MB. If you have three File Upload Fields, the maximum upload capacity for all three fields must be 25MB or less.
We suggest adding supporting text to the File Upload field stating that the total file upload data must be no larger than 20 MB (or lower if you choose) as a safeguard.
Furthermore, if you are attaching uploaded files to your Notification Emails, they are limited to 14 MB. If your upload(s) are larger than 14 MB, it will send links to the upload instead.