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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Yes, once the user clicked the file upload button in the form, an option will pop-up asking what file the user wants to upload.
You can change the file size limit in the Form Builder. Just select the File Upload field and then click the "Max File Size" button. After that, you need to enter the file size in kilobytes. The maximum file size is 1GB per submission.
Hope that helps. Thank you.