Motorola Xoom :: Retrieving Documents From The SD Card

I have setup Astro file manager to default to the external SD card when saving and retrieving files.

Today I was "editing" a PDF and after saving the edits chose to "send" it from the app itself. The app prompted me to use Gmail. It opened Gmail and, as far as I could see, attached the file to the message and prepared to send it. I sent it to my work email address. I was not on line at that time however not long after finding a hotspot I noticed that the message appeared on my work blackberry. BUT no attachment.

So then I , on my XOOM, opened Gmail and manually attached the file to the message and sent it. Again it appeared on my blackberry but again with no attachement.

I then went into Astro and moved the file onto the internal memory, created a new Gmail message and located the file internally, attached it to the message and sent it. This time my blackberry showed an attachment. So it seems that whilst I can open files from the external SAD card, edit them and save them I cannot pick up these files for attaching to an email.

Is this a XOOM or an OS issue? If an OS issue does ICS resolve it? If a XOOM issue, why is such a basic requirement overlooked?