Reject: Error R0000-058-01: An XML document that represents a binary attachment must have a valid reference to an attached file.  Resolution: Please remove the PDF attachment when sending
the extension. If the PDF attachment is needed, please review the PDF attachment sent and make sure the description, filed form attached option, link to form and activity number are correctly entered, and PDF attachment can be viewed.

Need to attach PDF because of foreign forms which are not supported.  Went through the solution multiple times, reduced the sized and re-attached, shorten the name, but can not figure out the "must have a valid reference to an attached file."  Did everything that was suggested to fix but the e-file error remains.  Help?