For devices without specific integrations, I have been able to learn the IR codes directly from some of my remotes but not others. I don’t understand why some remotes can be learned without difficulty while others cannot.
For example, I was unable to learn the IR codes from an old Velodyne Digital Drive subwoofer remote and a new HiFi Rose RS130 transport. For the Velodyne, I found the Pronto code set, manually uploaded it, and it worked as expected. HiFi Rose does not publish the IR code set for their remote.
I was able to successfully learn codes from a couple of PS Audio remotes. So I know I am able to go through the learning process correctly.
BTW, I was able to learn the codes of both remotes with an old Sofabaton remote. So I don’t know why the UC R3 docks are not able to learn the codes for the two aforementioned remotes.