It was baffling to me that this guy from "Keysound" Leicester, didn’t say that the app was called "SongBook+ from the beginning of the video and has been around for many years, he was talking like he made the app. himself.
I think what he has done is link the pdf sheet to registrations on the keyboard and put a few songs together for players that don’t want the hassle of doing it themselves, fair enough.
I use it the other way, when I call up a registration it calls up the sheet music on the iPad, you can do a lot more with this app. it’s excellent value for money, like Dutchie said, it’s on the ‘App Store’ and used by many members here.
Pino