On the Samsung device, we can use our own ringtone in addition to the many standard ringtones, using your favorite song, music, or downloaded ringtones.

The Samsung device scans the entire memory (including the memory card) for ringtones, so it does not matter which folder the custom ringtone is located in.

Note: This guide shows how to select your own ringtone, which is already in the phone memory of your Samsung device.

Android 10 (One UI 2.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Sounds and vibration
Step 3:  Tap on  Ringtone
Step 4:  Choose desired  SIM-Card
Step 5:  Tap on  Add
Step 6:  Confirm with  Allow
Step 7:  Choose desired  Ringtone
Step 8:  Tap on  Done
  1. Open the Settings
  2. Tap on Sounds and vibration
  3. Tap on Ringtone
  4. Choose desired SIM-Card
  5. Tap on Add
  6. Confirm with Allow
  7. Choose desired Ringtone
  8. Tap on Done

Samsung Instructions