DJI Fly app pro edition feature is great, but in my case it only works right when using cache files recorded during flight into smarphone memory.
Everytime I tried to use non-cache video files I suffer app editing issues. I copied HD files from Mavic Mini sd card to phone folder, add them to DJI Fly proyect, start playing and suddenly app crash. It happens more frequently when I have added many clips. It makes me thinks is a memory-related issue. After all, a mobile phone cannot behave like a desktop computer.
By the way, I'm using Samsung A40 4Gb internal memory Android 9 PIE smartphone.
R.