Haven't been for several years now... you need to download it directly from the DJI site & sideload it to your mobile device.
Here you have it --> DJI Go 4 - Download Center - DJI
Read up more about panning speeds vs shutter angels & judder/motion blur here --> Panning Speed Best Practices
The panning speeds you show in your clip, is when you rotate CW about 7sec for the full image width & about 3sec when you pan CCW...
Yeah, I agree.
Seems like you have a gallery app on your computer that have been set to look for photos when something is connected (your screen shots doesn't show a DJI message... it from that gallery app on your PC).
Close that window down &...
Good positional data aren't just dependent on the number of locked satellites... in the logs you also find something that DJI calls GPSLevel (or Navhealth), it's a kind of confidence computation that tells the flight controller if it can trust...
In general you update, refresh & downgrade through the DJI Assistant 2 computer software for your drone model.
In Assistant 2 you will se which possibilities you have regarding the firmware... if the firmware you want to downgrade to isn't...