As far as I am aware, there isn't a way. I tried to do this last month, but couldn't find any solution. I think I also found a previous post that stated it wasn't possible. What I ended up doing was converting the pdf file to an image and posting it using my own html coding. Sadly, the quality of the image was far less impressive than my pdf file. I'm hoping they resolve this issue soon because I would love to send pdf files instead. If you find out a way, please let me know.
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