Too many files I think jimmy. It will only let you upload a few here. You need to upload them to steam instead.
Daz40 posted some instructions i followed.
"You need to click on your screenshots then right click and save link address And paste In here.
1. F12 to take the screen shot.
2. Shift + Tab opens the steam overlay while the game is still running. Click on screenshots and upload the ones you want.
3. Either close or Alt+Tab from the game and open the steam client.
4, Click on 'your name' >> content >> screenshots.
5. Left click on the shot you want to post,. It should spawn a smaller window with your screenshot in it.
6. Right-click on the shot and choose "Copy Link Address". Or click again and hit Ctrl+C
7. Ctrl+V the link in the reply box on CustomsForge. It will auto-replace your link with an image."