Mounted SD card not working I recently mounted an SD card to my phone. But when I tried to download an application from the play store, a message popped up saying my phone didn't have any storage on it, saying my internal storage was low, but my SD card had 28.2 GB on it left, which my phone had recognized. Yet applications weren't being installed using the SD card, whilst any photos taken are stored using the SD card.

Any advice of what to do or how to fix this problem?
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.