Arena 6 - Group in advanced Output Problem

[SystemD]

Hello,
I can not cast more than one video in a slice in a group.
I have 3 groups (each includes a layer with a camera and a second layer to broadcast over a video). Each group is intended to project on a different screen. For each slice, I chose the corresponding group, put only the camera is displayed, impossible to have the video over.
I have 3 groups with the same configuration, the problem is the same.

did I miss something?

[SystemD]

Rectification : my problem is only with images (jpg), not with videos

[Zoltán]

In your screenshots only one camera clip is playing in the composition, so I can't see the issue.
I tried to recreate your setup, but it works for me as expected.
Please attach your composition and the advanced output preset, so we can take a look.
Thanks!