Connection between Media Gallery and Wix Pro Gallery

Hello Everybody.
I’m relatively new to Datasets but have been on Wix since Flash)).
I’m trying to connect a Wix Pro Gallery to the Collection via Dataset and doing everything exactly as described here:
As long is field type is set to “Image” everything is fine but once I change it to Media Gallery or Video the When I’m trying to connect “Image Sources Connect To” is greyed out.

I was under impression that Collections connected to Wix Pro Gallery can utilize both image and video…
Please help. Thank you!