I read about non related attachments (the first of the FAQ list). But some things are still unclear to me.
I would like to show the EG-attachment sidebar widget with attachments of a specified post independent of which post or page you visit (so always).
Is it possible to change it just in settings or in the editor. I think I need the editor to adapt, but which file do I need? I think I have to change if (post-id=current post-id -> show id attachments) in something like id:="specified-post-name" -> show id attachments.