Once you have taken a picture in Photo Mode, where is it stored on the local drive. I spent 15 minutes this afternoon trying to find it.
On my PC the photos are in C:\Users\Rob\Documents\My Games\TrainSimWorld5\Saved\PersistentDownloadDir\PhotoMode Obviously your profile name will be different but the sub-paths should be the same. Hopefully.
And for steam those will be in C:\Program Files (x86)\Steam\userdata\your account number\760\remote\2967990\screenshots
I am on Steam, but one other likely location (on my machine, for instance) - C:\Users\[username]\OneDrive\Documents\My Games\TrainSimWorld5\Saved\PersistentDownloadDir\PhotoMode So far as I know, not documented by DTG - also the game and engine .ini files are in OneDrive below the Saved\Config\WindowsNoEditor I don't use OneDrive, but Microsoft does not care...