I'm not sure if you're testing the ability to put thumbnails in your journals or not, but if you are:

I've tried this before, but it seems that it's not possible to do thumbnails and banners and such unless you have a subscription. I know you can throw up icons and whatnot for other deviants, but thumbnails seem to be some kind of privilege. Not really sure why...

If that wasn't what you were testing, then feel free to ignore this message, lol.

Wait, wha-? *goes to see if nix has a subscription* ..... Oh, that'd do it. XDDD *hits self* I had a similar problem with icons, and I thought that was it, but now I feel silly. Thank you so much for clearing this up! *will be doing that feature-thing after coming back*

Glad I could help!