Question: how to transfer files from internal storage to sd card lg g6?
Answer: From a Home screen, navigate: Settings. ... 
From the Internal storage screen, tap appropriate folder (e.g., Music, DCIM, Ringtones, etc.). ... 
If desired, open the folder to select files.
Tap the Menu icon. ... 
Tap 'Move' or 'Copy'.
Tap the desired file(s).