Roadrunner: the truck isn't painted. The first release of this kit (blue truck on the box) was molded in this colour and I polished the plastic. Yes, "insert other media" didn't work for me either, that's where I got frustrated. So I went back to the method I've always used (!) : Open Photobucket in a new tab and go to "library". Under each photo is a list - email, direct, HTML and IMG. In IMG copy the URL, then leave P/bucket and go back to MCM. In your new post, click where you want the image to be and paste the URL there. (At this point you could open P/bucket again and grab another image in the same way.) NOTE: Only the URL will show but it will appear as the actual image AFTER you've submitted your post. Previously you could see your images before posting by using the "preview post" function and I'd like to see that re-instated.
Also the head-and taillight bezels and the bar that sits above the rear bumper, all of which would be difficult to cover with BMF. It's not a big deal - I often have to re-chrome kit parts or fix them with BMF.