From a Home screen, navigate: Apps icon > Settings > Storage & location.
From the Device storage section, select the name of the folder(s) containing the file(s) to move to the SD (Memory) Card (e.g., Images, Videos, etc.).
Press and hold down the desired folder to copy or move.
Selected when a check mark is present.
If an option is unavailable (grayed out), that media type is not currently stored within the internal storage.
Tap the Menu icon (upper-right) then tap Select all to select all folders.
Select 'Copy to...' or 'Move to...'
Tap SD (Memory) Card.
Tap 'Copy' or 'Move'.
The option depends on the previous option chosen.