Just upgraded to 2.1, thought I would give feedback:
I have been running previous version on iPad and two android devices (Samsung Galaxy Note 9 and Note 20 Ultra 5g). The app was working perfectly on android devices and iPad.
For me, upgrade works great on iPad. No issues, seems just like the previous version. Android was not working properly on first installation. When slewing, my mount just took off and app would not stop mount. Turned everything off, re-installed app on Note 9 and it seems to be working, but slow at times and somewhat "buggy". Sometimes it seems like the phone is "overloaded" and the slew commands lag by several seconds. If I use the right arrow to hide the slew tab, at times I can't get it to return. By exiting app and re-enabling it it seems to work. Usable but not flawlessly as it was before upgrade.
I got it working with my Sony A7R IV A. (you show it as untested). Seems to work perfectly. If users have trouble, make sure they have their Sony in PC Remote with USB. Also, I had to go to Setup4 menu and put USB LUN setting on "single". Also, make sure drive mode is "Single Shooting", in order to set camera to "BULB".
Thanks ZWO, and get the Nikon Z9 enabled as soon as you can! 🙂