yes, it seems to follow the same parameters as u-connect for the regular pacifica (search for the thread, it is easily located if searched for something like "uconnect theater usb video").
to summarize, generally everything that chromecast would play, plays, except for 1080p. 720p, h.264 level 4.0, AAC (including 5.1), mkv play fine. 128Gb/ntfs works (some people said one would be limited to 2Gb files with fat32, i did not check for that, just used ntfs/128G). Some people on this forum/thread reported success for 1080p, but alas, not for me.
Honestly, the displays are 720p, so even if it worked, it would have been just waste of space and decoding energy.
One important thing, mkv titles better not have chapter markers. Otherwise, uconnect theater would show the name of the first chapter instead of the name of the file and you'd see something like "chapter 1" in most such cases instead. Why they did that is beyond my comprehension. some people on the forum said if that's the case, it is possible to edit chapter name on windows (I did not verify that).
USB compatibility may vary it seems according to people on this thread, but this usb 3.0 I bought, works: https://www.amazon.com/gp/product/B01BGTG2A0
. I love these drives. superfast and inconspicuous (especially in a car).
Other than those limitations, it is rather good. Screens can watch same or different videos from stick, or even same video but at different location, or any combination of the above with bluray. (Well. i don't think you can watch two different points of the same bluray though, i did not check). Displays are quite adequate. Can route any source thru the speakers (or not, listen to something else entirely while two other sources are playing thru headsets).