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.
Petaform - Upload files in Google Forms without sign in
Google Form Without Sign In
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Petaform - Upload files in Google Forms without sign in
Upload Form Files to Google Drive with Gdrive File Uploader
Upload Form Files to Google Drive with Gdrive File Uploader
How to Upload Files in Google Forms
How to create a Google form that doesn't require sign-in to fill
Access to form for users outside our organization and who do not