If a 64GB card is not working in the dash cam, try the following steps:
Unplug the dash cam from power
Remove 64GB SD card whilst power is OFF
Turn dash cam back ON without any SD card inserted
Connect to dash cam Wi-Fi & connect with Gator app on your phone
Insert SD card whilst dash cam is still ON and you are still connected with the app
Format the SD card using the format options in the Gator App
Power the dash cam OFF
Turn dash cam back ON, it should now work correctly with the 64GB SD card installed.
For screen or non wifi models follow the same process but use the dash cam settings menu to access the format options.