Hyperdeck Studio Mini Keying with ATEM

Anyone using the Hyperdeck Studio Mini with an ATEM and using the dual output for key and fill for graphics or video playback? I was wondering how that worked and what kind of files need to go on the Hyperdeck for that to work properly. I can't seem to find any details in the manual for it, but it is talked about as a feature on the BMD website.

[Gary Adams]

Hello David. This is a Prores 4444 file up to HD 59.94p with image and alpha channel.

Regards, Gary