Question: how to transfer data to sd card on lg k8?
Answer: From a Home screen, navigate: LG Tools Folder. ... 
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 and select a file(s).
Tap the Menu icon. ... 
Tap Move or Copy.