You can currently upload and send files in PDF, DOC / DOCX (Microsoft Office) or ODT (OpenOffice) format. However, we are working to increase the number of compatible formats.
PDF documents. It is an open format that's compatible with almost all systems. There are lots of simple ways to create a high-quality PDF file from any sort of information.
The fastest and easiest way to create a PDF is to use a free virtual printer software. This type of program can create a PDF from any other file. You simply 'print' the document using the virtual printer (which you need to download and install like any other software).