Can I Share a Password-Protected PDF File via a File Link?
Yes, the user can create a regular File Link for a password-protected PDF file. However, if they want to create a Preview-Only link (that does not allow downloading the file), then, unfortunately, such link will not work because the content of the file is not accessible without the password, leading to failure of preview generation.
To create a Preview-Only link for the file, one can save a copy of the file that doesn't prompt for password and then create a Preview-Only link that is also password-protected at the link level: