Mounted SD card not working
APPS CANNOT BE PLACED ON SD CARD. It's possible with app like link2sd (need root) or adopting sd card (android 6+ feature, see adoptable storage).

Some phones including Huawei have 'Move to SD' option but this option move files in internal SD (if /data and /sdcard are separated partitions) or move very small amount of data. For details, also take look at app2sd wiki and link2sd wiki.