I have seen many discussions on this board and many others about Roku's (and other video players) inability to read ExFat drives, but I have not seen anyone request that feature be added to the Ultra. I also have been reading that many people seem to have trouble reading HFS format on the Ultra. Perhaps I am incorrect, but isn't the only reason that people purchase the Ultra is to get the USB access?
So this is my official request, ROKU, please add ExFat access to the Ultra.
Another option would be to add access to an ExFat app the way Synology does it. Yes, it costs $3 but solves ALL the incompatibility issues.
exFAT is no longer owned by Microsoft. They gave up their patents to it to the Open Invention Network and now it is freely available to use, which is why support for it was recently added to the Linux kernel.
There is now no reason as to why Roku can't add support for it.