Hello Chodec974, you need to gain access to the steam screenshot folder with the help of steam client. You can follow these commands to do it. In the menu bar press on View and choose the option of Screenshots. Now here on the Steam screenshot manager, you will see it. Your screenshots will be shown here with options on what to do with them so don't forget that we’re looking for the Steam screenshot folder. We will find
How to Access Steam Screenshot Folder - Appuals.com here. Then tap on one screenshot, then notice the button at the bottom of the screenshot manager that says “Show On Disk.” In the end, in case you tap this button, you’ll go to your system’s File Explorer, where you will find that certain screenshot, so in that folder, you can access that screenshot and other screenshots that you took in the past.