The following media formats can be uploaded to your embed signage account:
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​Images (.jpg, .png, .gif, .svg)
​Video (.mp4, mpeg, .avi, .mov, .wmv, .webm, .flv)
​Audio (.mp3, .wav, .oga)
​Other (.html, .swf, .otf, .ttf) 

A list of file size recommendations can be found here.