I have a Mini 2 on the way and have been trying to install the DJI fly app on my phone. Looks like it's installing and then, for whatever reason, I get the message "app not installed". Doesn't say why, how to reinstall, or anything. Do I have to buy a new phone? My current phone is Android 8.1 and SHOULD work according to DJI website. Any help would be appreciated. I want to start flying as soon as my M2 arrives.