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Do not build this by hand. Open the file, choose Share → Copy link, and paste that in as the Destination. The same applies to a Sheet, a Slides deck, and to any file or folder in Drive. Swapping /edit for /preview opens a Doc read-only, without the editing toolbar — usually what you want on a tag.

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Who can open it

The file’s General access setting decides this, and it is the only thing that matters here:
  • Restricted — only named people, and the default for a new file. A scan does not bypass it: anyone else gets Google’s request-access screen, which is the file behaving correctly.
  • Anyone with the link — what you set if people outside your organisation should be able to open it.
Set the role to Viewer unless you genuinely want scanners editing the file.
Test in a private window before you produce a Batch. Signed in as the file’s owner, everything opens — so a Restricted file looks fine right up until someone else scans it. The access rule is doing its job; you just want to know which rule is set before five hundred tags carry the code.