Samsung Galaxy J7 V / J7 (2nd Gen.) - Save a Ringtone
From a Home screen tap the Messages icon .
If unavailable, swipe up then tap Messages .
From the Inbox, tap the message containing the ringtone.
Touch and hold the the attachment box.
Tap Save attachment.
By default, the sound file is saved to: My Files / Downloads.
To view the sound file as a ringtone option, it must be moved to: Internal storage / Ringtones.
You can use My Files (Apps > Samsung > My Files) to move files.