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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I can see you have added an upload file field to your form and a widget to upload files as well.
1. It is the field and it allows to upload files only directly from your computer:
2. This is a widget "Kloudless File Uploader" it allows to upload the file directly from your computer, the same as the upload file field, but this also allows to upload the file using another 3rd party service such as Dropbox, Google Drive and Box:
There are another widgets that will help you to upload files, here is the link to our file upload widgets category: https://widgets.jotform.com/category/file_upload
If you have questions, please let us know, we will be glad to help you.