Once you’ve chosen a video or photo to upload, make sure it’s smaller than 2GB in size and less than 15 minutes in length. Acceptable formats include. AVI, FLV, MP4, M4V, MKV, MOV, OGM, WMV, WEBM, MPG, MPEG, M2V for videos; and BMP, JPG, JPEG and PNG for images. There are restrictions on some formats (e.g. WMV files need to be non-DRM protected, etc.). If in doubt, try it out. The system will let you know if there is an issue with the file. Keep in mind that non-video and non-image file formats will not be accepted (e.g. PPT, DOC, PDF, SWF, etc.)