Question: how to transfer files from galaxy s3 to sd card?
Answer: From the home screen, tap Apps.
Scroll to and tap My Files.
Tap All files.
Tap Device storage to access phone storage.
Scroll to and tap the required folder where the file is stored, (e.g. DCIM).
Tap the required folder (e.g. Camera).
Tap and hold the required file.
Tap Copy.