You can add a file upload question in your Google Form to allow your users to upload file(s) as response to the question, but this option requires sign in. You can use the Formfacade add-on to convert Google Forms' file upload question into HTML file upload and let your users upload files without sign in.
TeachingTechNix: Google Forms: File Upload
I have changed the settings in my form to allow anyone to fill it
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Petaform - Upload files in Google Forms without sign in
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How to Upload Files/ Upload Option Using Google Forms
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