I am either dense or I am not explaining clearly. The procedure in the link tells you how to post a picture from your computer. I have no problem doing that because when you upload the picture from the computer to the CDC site, it drops it into the bottom box and all you do is click "insert inline" and it post your picture to your thead.
What I can't do is get an existing picture from the CDC file of previously posted pictures to the bottom box. The only option listed is to drag and drop. That works fine on my PC but not on my tablet.
Not a big deal, I'll just post from my PC if I need to re-post an old picture from the CDC archive.