How to enable some users to only view the app and others also to edit it?

[oren0e]

Hi,
Following this https://www.youtube.com/watch?v=Ykdnbt52t5k at 4:05 I understood that you can set an access role to table-1 in the "Data" panel for the users with this role to be able to update the table in the screen (=the published app), but you can set another role in the screen section under "Design" so those users with this role will be able to only view the same app.
I have created a "Viewer" role and an "External Updater" role like in the image. The former was set for the tables in the screens section ("Design") and the latter was set as the access role for the table in the "Data" section. However, a user with the "Viewer" role cannot view the tables, I get "You don't have access to this data" message. What am I doing wrong?
Just a note - I don't want to create 2 different screens with the same content but in the first a table and in the latter a view, I just want to set access levels to the same content.