I created a custom content type, and users in my community can create nodes using it. I then created a Views block attachment, and set an Argument using UID. I tested the argument in Views and indeed a node I created (UID = 1) displays in my block attachment, and any other UID yields zero results. However, when I visit user profiles the attachment is not displaying on my profile or any other profile page.

I can't use the Views filter of user=current, because I want other users (community members) to be able to see the custom content node(s) that user created, if any, when viewing the person's profile.

Any idea what Argument setting(s) I'm doing wrong? Sorry if I'm not explaining my situation well.