Your picture may not show up in the item correctly, or you may get "errors", "warnings", or even invalid LMS XML responses
There could be many reasons why you are having issues uploading a picture. But this article will describe one case.
When forming your API request, if a "bad" URL is provided for a PictureURL, instead of a typical Ack=Failure response, a SOAP Fault occurs.
Flow of Events: PictureURL with space(s) results in a SOAP Fault -> We retry 3 times, but it's still a SOAP Fault -> We write out the generic error that has a broken close tag -> You get invalid XML, error, or a warning.