OBS either only records voice or desktop audio even though it just doesn't make any sense at all?

[vexbob]

I did everything important in a picture and a test clip by saying something at the beginning and later playing one of my videos
foto: https://prnt.sc/t00va1
video: https://www.youtube.com/watch?v=_b6_IbDW7rQ&feature=youtu.be

 

[vexbob]

should be better solution