All the craft movements there in the end suggests that this is due to a sudden thrust loss in the rear right corner ...
The telemetry shows you abruptly letting off the elevator stick to neutral (black dashed) at 670sec into the flight, the craft pitches up to brake (green) but at 672sec the craft rolls (blue) rapidly to the right & goes spiraling (purple) CW to the ground.
Rolls to the right = lost thrust on the right side
Yaws CW = lost thrust from a CCW torquing corner = rear right
I guess that the lost thrust is due to that a prop fails ... this as a "NotEnoughForce" message (light blue background color) comes at 673,5sec. This is usually generated when a motor no longer can rotate faster as being on max rpm's already.
(Click on the charts below to make them larger)
View attachment 146272
Furthermore I suspect that this incident actually started already at 609sec into the flight ... looking closely on the pitch, roll & yaw axis from there shows a vibrating/erratic behavior ... like part of the prop have broken off leaving the prop unbalanced which generating vibrations. Look at the green, blue & purple graphs in below chart, the craft also from there shows a height instability (look at the red graph) ... the red star with the green bar in the sat. picture shows where the craft was when this happened.
To be able to say for sure if the thrust loss was due to a motor or a prop failure the mobile device DAT log is needed. The correct DAT log ends with FLY068.DAT.
View attachment 146274
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