This was their recommendations:
1. Find the setting of "Install unknown apps" in the phone system settings, and turn on the switch of "Allow from this source" to have a try.
2. If the "Install Unknown App" setting has been turned on, please uninstall the old version of the app after backing up photos and videos, restart the phone, and download then install the APP which downloads on DJI official website.
3. Next, kindly uninstall and re-install the DJI Fly app via our official website
DJI Mini 2 - Downloads - DJI
*Note: Please kindly backup all the necessary files before uninstalling the apps.
I haven't flow with the Galaxy since doing this other than in the back yard but will monitor it.