mpu9250 use fifo with slave 0 device (AK8963)

Anyone know how to correctly put AK8963 data to fifo also with gyro data?
my steps is:
1. enable gyro, and configure gyro
2. enable 8963 and configure 8963 (as slave 0, read out 6 bytes in continuous mode)
3. enable fifo for gyro and slave 0

but the data get from fifo is messed gyro, no magnetometer data found.

Thanks.