The help info is not super helpful in answering this specific question. Can I send a proof to someone not shared to a sheet? Do they need to have the sheet shared with them in order to interact with proofing?
No, you don't have to be shared with the sheet to interact with proofing. But they will have to have a Smartsheet login.
The first time you send them a proofing request it will ask them to create an account. They can then take part in proofing, without accessing the underlying sheet.
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