Images and Download folders

I am wondering where the screen snapshots are stored if I want to reuse them with the Browse button?
I see that there are folders called images and download. Inside images there are folders named like
0fa36598-56a7-419b-9342-a0ddb07634bf that contain images but there seems to be one for every run of a script. Are these the debugging images? Inside downloads there are also folders apparently related to a single run but I am not sure what the contents are.