Use USB multicable in combination with HDMI out on A7RIII

[Sander]

Hi, I'm facing a problem.

I want to control the A7RIII by using the USB multiport cable and get the live image of the viewfinder over HDMI.

We use the A7RIII on a drone to take aerial pictures and movies.
We have to use the USB multiport (USB PC Remote) in order to take pictures and to start/stop video in Manual photo mode. 
This will not work by using WIFI.

This works perfect as long we're not plugging in the HDMI cable into the camera.
When we use the USB multiport in combination with HDMI, the HDMI feed goes to black when we start recording.
Taking pictures works like it should be.

I think I've tried everything to solve this problem, but nothing seems to work.

Somebody with the same problems?
Somebody with a solution?

+10.000 karma points for the person who can help me out!

 

[VTC]

Don't know why things would be any different on the 7Riii but on my 7Sii I routinely record with a the USB multiport occupied by either the Sony wireless trigger (in photo) or a Fotga wired remote when rigged up and get video on both the rear screen and a Blackmagic VA 5.

 

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Edited February 13, 2019 by VTC

[VTC]

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Edited February 13, 2019 by VTC