Add a PDF as an "Attachment" in FigJam - instead of converting it

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Please do this. I want to collect a file, and not to create a board from it. 
Storing a file is more frequent for me and only sometimes converting it into the board.
If you create a preview of PDF(!), DOCx, XLSx, PPTx (less: different CAD formats) 

please do this. we want to use figjam as an alternative to other services like miro. we want to use it as a collaborative research and design space. uploading pdfs is essential for this.