I bought the 891 with cables. I got it briefly working on Windows 11 but, I’m not a PC kinda guy.. neither computer nor Politically Correct 
That said, if I didn’t kill the goose with that statement.. I’m wondering if anyone has been successful in setting up the DR891 on a late model iPad. I’d really love to do that.. A big plus is that the battery would last much longer than my Lenova battery.
Thanks, Bill