Lost control of mini 3 pro

Lost all control of my drone whilst flying near the river. Looking at the flight log there is a yellow line on the flight log at that point is where I lost control. It then proceeded to fly straight up and then straight down into the water I had no control after the yellow line on the flight path.
Can anyone decipher the flight log and give me a bit more insight to what happened?.
Ps the forum won’t allow me to upload a file or attachment as I’m a new member, how can I share my flight log?