As it turns out, the fix is simple.
The connection name was too long.
I reduced the name to 30 characters and it immediately started working.
I also want to add that if there is an error in the callback function, you will get this error.
IMAGE DOWNLOAD ERROR
Well, this error reappeared on me, but this time when I uploaded the images.
imageObj.source = partialURL1 + partialURL2 + partialURL3;
var someURL:String = partialURL1 + partialURL2 + partialURL3
imageObj.source = someURL;
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