Allow Unknown Sources: When prompted by Chrome or Files, tap Settings and enable "Allow from this source".
Google Play Protect: If a warning screen pops up saying "Unsafe app blocked", tap More details → Install anyway.
Background & Battery Permission: After installation, set battery usage for the app to "Unrestricted" so location tracking continues while screen is off.
Note: Make sure GPS / Location is turned ON and set to High Accuracy on your phone.