The online editor supports images/photos, video, audio and font uploads. These can be locked down and pre-set if you have the branded editor add-on.
Images
JPG, GIF, PNG, PDF, TIFF, BMP, and WEBP
Video
3GP, 3GPP, AVI, DIVX, DV, FLV, M4V, MJPEG, MKV, MOD, MOV, MP4, MPEG, MPG, M2TS, MTS, MXF, OGV, WEBM and WMV
Audio
AIF, MP3, M4A, OGG, WAV and WMA
Fonts
TTF