Video: mov, avi, mp4, m4v, mkv, wmv, mpg, mpeg, webm, ogv, 3gp, 3gp2, 3g2, 3gpp, 3gpp2, Youtube and Vimeo links (embedding currently not supported)
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Imagery: gif, jpeg, jpg, png
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Documents: doc, docx, pdf, xls, xlsx, ppt, pptx
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Audio: m4a, mp3, wav, wma, aif, ogg
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Tip: Loading larger files can take a little longer, but connecting to Wifi can speed up the uploading process.