Vero4K: want to use as PVR / view OTA broadcasting

So, antenna is on the roof and 39 free OTA stations are coming in.

Bought and put in a HDHomeRun Duo which seems to be working fine. Unfortunately sometimes the sound and picture is out of sync. The TV, the HDHomeRun and the Vero 4K are all plugged into the same router, so I’m not sure what is going on there.

I have no clue how to get the PVR aspect of things running.

I followed these instructions and it seemed to do work. No errors were encountered.

After that, it sort of falls apart. I can watch live TV through the Vero 4K and there is a on screen guide that shows up, but I can’t figure out how to get it to record. My goal is to have recordings go to my Synology DS418j located elsewhere on the network.

I’ve poked around and can’t find step by step instructions to get this working. Any ideas or links?