Currently, when it fails to upload and gives you a "TextureLoader cache hits/misses 0/1" Error. It gives you the name of the temporary png file in the logs. You can't tell what the original png file was on your had drive that was in the FBX file. It would be nice if the error message told you the name of the specific file on your hard drive that was in the fbx that caused the error. Now you have to look at them all and just check them to see if they look alright in terms of power or 2. I know the name of the file on the disk is still in the FBX file when it gets read in by the upload program, so, it seems like it could be included in the error message.
Name of offending png file in upload