Are 4K video files support by TivoDesktop/PyTivo?

Now that I have a Tivo Bolt and 4K TV, I would like to update my camcorder to a 4K model. Is there a way to push my 4K home movies to the Tivo? I exported some sample 4K clips from my editing software in mpeg 4 format at 4K resolution. PyTivo could see them and acted like they copied to the Bolt. When I play them back I get a black screen. Is there a particular format that is supported for 4K video? If not, does Plex support streaming 4K through the Tivo? Thanks.

Are 4K video files support by TivoDesktop/PyTivo?