Question: how to transfer internal storage to sd card lg g5?
Answer: From a Home screen, navigate: Tools. ... 
If presented with Terms and Conditions screen, to continue, tap Accept.
From the Internal storage tab, tap the appropriate folder (e.g., Music, Pictures, Ringtones, etc.).
If desired, open the folder to select files.
Tap the Menu icon. ... 
Tap Move or Copy.
Select the desired file(s).