Just got this phone and can't figure out how to set my 64GB microSD card to be the default internal storage. I've read that when you insert the card, a notification should appear that says "set up" or something, but all I can do is open the card in My Files. When I look at the card in storage settings, all I can do is "unmount" or "format," neither of which do anything. I can't even transfer apps to the SD card by hitting "change" because that button doesn't appear in the app manager. Incredibly confused.