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I am not sure if I have understood your question correctly. We have received an empty question with just the title as "max file upload size".
Do you want your users to be able to upload bigger file? Please be noted that by default, file uplo field is set to allow 1 MB of file upload but it is possible to increase the file upload size limit. The following guide should help you: https://www.jotform.com/help/33-Changing-the-Upload-Size-Limit
Hope this helps.
Do get back to us if you have any questions.