Tap on my File app, ( here sdcard0 is phone's internal storage, while sdcard1 is the microSD card )
First open sdcard0 and browse to DCIM, Camera. Here you'll find any shots taken by your camera.
Tap the three dots at the top right of the screen and choose Multi-select.
Tap on each item you want to move to SD, when selected the white text becomes yellow. Now choose Move, browse to the microSD card and choose Move here.
Repeat the process for any music and other files stored on your device
