You cannot make screenshots with steam overlay, which is sad and was requested in the past. I do those via Windows. You can however add pictures to the artworks and integrate those in guides on steam.
The logistics hell this game is IS the fun part! - Maerchen, 2020
The good thing is, we have all the information in the reports. The bad thing is, we have all the information. Maerchen, 2020
Came for SE. Will stay for SE.