Save to micro sd

[AC Question]

Expand my device storage to sd card

 

[Rukbat]

You put individual files on the card, using a file manager. Since Android 6, you can format the card and use it as storage for anything (you no longer have "an SD card", it's just part of "storage", but if it goes, you lose all the apps that are on it, including Android itself if any parts were moved there).