If a watermark is desired on photos taken with the Samsung device, it can be activated in the camera settings. The watermark is placed in the lower left corner and can be customized with a custom lettering.

The position of the watermark cannot be removed, nor can the camera icon or the text "Samsung Quad Camera" (or similar).

Android 10 (One UI 2.0)
Step 1:  Open the  Camera -App
Step 2:  Open the  Settings
Step 3:  Tap on  Watermark
Step 4:  Enable or disable  Watermark
  1. Open the Camera-App
  2. Open the Settings
  3. Tap on Watermark
  4. Enable or disable Watermark

Samsung Instructions