Guides: collecting files with Google Forms and Drive

Plain-English answers, citing Google's own help pages.

Google Form file upload without sign-in: what works: Why Google Forms requires sign-in for uploads, and every workaround compared.
How to collect files in Google Forms from people without a Google account: Options for respondents who have no Google account.
Google Drive file request link: let others upload to your Drive: Drive has no Dropbox-style file request. Here are your options.
"This form cannot be embedded": Google Forms with file upload: Why a form with a file upload question can't be embedded, and fixes.
How to collect files from anyone without a Google account (2026 comparison): Dropbox, OneDrive, Apps Script, Formfacade, Jotform, EZ File Drop and CatchFolder compared.
Google Forms "Server rejected" upload error: causes and fixes: The common causes of upload errors in Google Forms and how to fix each.
How to let someone upload to your Google Drive (without edit access): Editor sharing vs visitor sharing vs upload-only links.
Google Forms file upload for non-Gmail users: Who can upload, and three fixes.
File upload greyed out in Google Forms: causes and fixes: Shared drives, DLP and respondent errors.