The Choose header Field where we are allowed to chose a "Custom header" has a slight Bug , if the uploaded Image file has a space within the name of the image ,it doesn't appear in the Newsletters when they are sent later.

Although we all know spaces are not considered a good sign on the internet but if you may please add a validation check so as to the images with a space may not be allowed.

I was helped by the Account Manager into solving this.
Thought to post it here if others get stuck on to it

Thanks