I don’t know, but even if you could, I doubt it would behave the way you want. You could, though, capture a Sheet’s URL in a column of type Url. This would allow you to share Sheets.
I want to attach a Google Sheet file as a supporting document to a journal in my accounting system. So, it should not be changed after it is attached, and anyone who is logged in should be able to open the file. So, attaching it as a URL is not an option.
@leinharte , then why you need Google Sheet type in this case? You can export this file as PDF in any big page format and share like that.
Or set access rights in source file (you or someone who has such rights) and publish it directly from Google Sheet as read-only file of some another type file:
GS / File / Share / Publish on the internet / {CSV, TSV, PDF, XLSX, ODS}
You can choose how will publish: full file or selected sheets.
hm… you wrote earlier:
You will receive a link in Google Sheets as I wrote above and will publish this link only in AppSheet. No users outside the app will have access to this link.