Collaborate with people who are not using a Google account in …
https://workspaceupdates.googleblog.com/2020/08/visitor-sharing-non-google-accounts-drive-docs-sheets-slides.html
WEBAug 31, 2020 · We’re making visitor sharing—secure, pincode-based collaboration with people who do not have a Google account—generally available. This means you can share items with non-Google accounts, enabling them to view, comment on, or edit content in Google Drive, Docs, Sheets, Slides, and Sites using a secure pincode.
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