If a user has viewing permissions on a page, can they be restricted from viewing attachments on that page? I know that they can be prevented from Adding or Deleting attachments, but can they have view permissions for select attachments, or another way, do Attachments have restrictions?
Partialy. Directly you cannot say that this and this attachement will not be visible to the user that is having access to the page. Rule is simple: If you have access to the page you will have access to the attachments.
So in that case since you are able to view attachements of a specific page and confluence allows to use attachments from different pages then simply create a page which will not be visible to the user (restricted), attach files you want to restrict and on a public page use attachments macro (or any other preview) this will restrict access only to specific people, groups that are set up in the restrictions.
Overall I recommend to have one single place for attachemts instead of adding them to the pages. If you are using new Confluence then there is a Blueprint for that called - File List.
I hope that will help.
I'm wondering if it can be done with using different screens for different users.
You could have a screen for one user type in both the create/view mode that has attachments and other set of screens for stakeholders (or whomever) for create/view modes that don't SEE attachments.
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