Board Thread:Challenge Threads/@comment-27048832-20160908095514/@comment-28548945-20170505190125

the game itself has a screenshot feature - most screens has that camera icon on the upper right.

using this feature adds the RR3 logo on the buttom right and player + car names on the button left though.

you also have to know where to find the screenshots taken by the game - its not in the same folder as device screenshots.