A collage consists of several pictures, which are put together in one image. A nice thing, because this way you can quickly unite impressions from several photos on one picture.
If you want to create such a collage with the Samsung Galaxy S20, this guide will show you how to do it.
Creating a collage with the Samsung Galaxy S20 - Instructions
Open the Gallery app on your phone
Select two or more pictures by pressing and holding down on one picture and then checking the checkbox for that picture.
Tap the three-point symbol in the upper right corner.
Select "Create Collage" from the context menu
At the bottom of the screen you can now change the arrangement of the collage.
When the arrangement is set so that the collage meets your requirements, select "Save" at the top right.
You have now successfully created a collage on the Samsung Galaxy S20. You can now find it in the gallery app and send it from there.