You can save the vector files as PDFs, which the system will allow you to upload.
To embed you have to first post your message, and then copy the file URLs which can then be embedded. If I'm embedding more than one file I'll open up a couple of tabs, or windows to effect this method.
edit: and if you don't have the software to convert the files send them to me, and I'll do it for you. :) (edited)