Watermark option not available S20+

Yeah, default settings won't be there..but if you want, can add it manually..

Open gallery>select any image>click on edit pen>now at the bottom select stamp section>here select calendar like icon(device stamp)>click on it>select device name stamp and date stamp.

It comes as a sticker in Image Editor.

But if I want to add for large number of photos? This is not feasible