Thank you all but that's not how i did it, you all left out one important step, so for all the people who look at this here is what you do.
Edit: Here is an update tutorial on how to do it. I noticed the one I had before was a little vague.
1. Find your asset you would like to add the thumbnail to.
2. Right click on it, go down to edit. A sub-menu should appear. Hit "Edit in Content Creator Plus"
3. You should see the main content creator plus window. On the left is a white backed area. Right click on the topmost category in that list. (See pic)
4. When you right clicked, a menu should have came up. Find "Add a thumbnails" (Yep. It's worded like that.)
5. When you clicked that, a new subcategory should appear on the right. You should see it. It will be named "Thumbnails" If you don't see the "0" under thumbnails, hit the "+" next to the thumbnails thing on the menu on the right.
6. Set height to 180, set width to 240.
7. Hit the 3 dots, then navigate to where your thumbnail is, then double click on it
8. Go up to file, and hit save.
9. Close Content Creator Plus.
10. Find the asset you just added the thumbnail to, right click on it, go down to edit, then hit commit.
Congratulations! You have added a thumbnail to your asset\layout.
okay so upon coming back here after many years it seems i deleted my pic that i put up here back in 07. i will reup a new one when i get one
Edit: Here is an update tutorial on how to do it. I noticed the one I had before was a little vague.
1. Find your asset you would like to add the thumbnail to.
2. Right click on it, go down to edit. A sub-menu should appear. Hit "Edit in Content Creator Plus"
3. You should see the main content creator plus window. On the left is a white backed area. Right click on the topmost category in that list. (See pic)

4. When you right clicked, a menu should have came up. Find "Add a thumbnails" (Yep. It's worded like that.)
5. When you clicked that, a new subcategory should appear on the right. You should see it. It will be named "Thumbnails" If you don't see the "0" under thumbnails, hit the "+" next to the thumbnails thing on the menu on the right.
6. Set height to 180, set width to 240.
7. Hit the 3 dots, then navigate to where your thumbnail is, then double click on it
8. Go up to file, and hit save.
9. Close Content Creator Plus.
10. Find the asset you just added the thumbnail to, right click on it, go down to edit, then hit commit.
Congratulations! You have added a thumbnail to your asset\layout.
okay so upon coming back here after many years it seems i deleted my pic that i put up here back in 07. i will reup a new one when i get one
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