MS SharePoint Lists - Accessing Embedded Files

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Actually, I do not have any errors, yet:

However, I see a table, only. I am not able to access files that are stored within a list element.

I was trying to retrieve some basic information (and maybe files in a later state) via REST API … however, I failed so far as explained in the following thread (I should have combined both … shame on me):

REST Get Request for Sharepoint

Dear all, I would be glad if someone could help me out on how to set up GET Request to be sent to a MS Sharepoint. Eventually, I want to identify users with access to items in a Sharepoint library which is only possible via REST API at the moment. I tried following setup but it only returns: 3000003;reason=“Invalid audience Uri ‘00000002-0000-0000-c000-000000000000’.”;category=“invalid_client” My workflow: Overview: [GET-Overview] OAuth2 Settings (will be accepted: “Authentication comp…