Experience of My Book 6TB used with Zappiti media player?

Hi:

Has anyone used a 6TB My Book with a Zappiti Mini 4k HDR media player, or as external storage with any Zappiti box at all?

I want to consolidate media off 3 separate WD Passports, and as a precaution I would like to know that the (new) WDMB 6TB is compatible …

I have read comments both ways, and Zappiti covers themself when I ask them and says “probably but we don’t guarantee it”. Possibly however, those who have had issues have not formatted appropriately and just said “doesn’t work!” without double-checking.

Alternatively, what WD drive is in the 6TB? Zappiti says blue is no problem at all, green probably ok, red/black/gold not compatible.

Any guidance would be welcome, especially form someone who has paired these two ok