The UDP (Unity-Distribution-Portal) interface appears to only support screenshots for portrait mode. Our game is played in landscape and therefore or images are formatted that way. Is this expected to change or will we need to format these for portrait. Assuming this is the same for videos as well? Screenshots & Videos* This material will be used by the stores to showcase your game to their users. Recommendation:384*640px - 1280*800px
General discussion is not a support forum and also I'm not even sure what UDP means in this context because a network protocol is the only thing coming to mind and that's not exactly the kind of thing where this makes sense.
There doesn't appear to be an appropriate forum for Unity Distribution Portal topics, though the few threads I've found on it seem to mostly end up in the Unity IAP forum.
You could also try the Android forum, since UDP appears to only support that platform. Not because it is any more appropriate, but your chances might be higher on reaching people who have knowledge on the topic.