It is basically very easy to learn with the existing remote control.
https://youtu.be/jNK2KsjGrc...
However, I reconfigured mine again, so I had to press the connection button on the external roller shutters myself (go to the roof). But this is only necessary if you teach it to a new remote control. You can find simple, well-explained videos from Velux for all the steps.
I now have my 4 external roller shutters in Homekit and can control them individually. Groupings are also possible.
I hope this helps.