I would like to have a collaboration role that only allows me to reference shared links.
Alternatives (1) through (3) could not be adopted for a reason.

(1) Why not just use the Previewer?
I want to collaborate from the top of the folder tree to prevent confusion about where I collaborated.
For this purpose, I want a collaboration role that can only refer to shared links that cannot refer to other files.

(2) Why don't we just create a shared link that is open to everyone and add a password?
If you make it public, you won't know who has accessed it.
Even with a password, there is a possibility of leaks.
If you are a collaborator, you can restrict the disclosure to collaborators only, so it is secure.

(3) Why don't you invite only the files you want to show?
I want to collaborate from the top of the folder tree to prevent confusion about where I collaborated, so I can't do that.