Alternative for video cache on Android cell.
Use a Screen Recoder.
Tested it today on Galaxcy J5 (very basic cell) and burned throught 3 batteries with no problems.
OTG cable.
It give me a quick tool to review the flight.
No other cache video is stored on the cell if one start the Screen Recorder before starting video recording on the Spark.

Hi there, thank you for sharing your video and sharing some additional information as well, well done. Fly safely. Cheers!

Could you please give some details as to which software you use to do this please, app details? Sounds a good idea, thanks.

Many Screen Recorders on Play Store.
Used DU Recorder - free to use.

Ok thanks, will check that out tomorrow.

Thanks for sharing