Windows File Path

C:\Program Files (x86)\Steam\userdata\60951074\760\remote\438040\screenshots

MacOS File Path

/Users/*Username*/Library/Application Support/Steam/userdata/60951074/760/remote/438040/screenshots

MacOS: Making the Library Folder Visible

Command + Space opens the Spotlight-Search. If you search there for /Users/*Username*/ you will find the Library folder.

The Library folder is not visible yet? No problem:

Right click -> Show View Options -> Show Library Folder

Windows: Create Desktop Shortcut

It is tedious to look for this folder over and over, in order to have a look at his screenshot collection. My tip: Just create a shortcut for the screenshot folder on your desktop.

A shortcut allows you to find your screenshots much faster.