FlexClip supports uploading various video formats (within 3G per file), including MP4 (H264), MOV, WEBM, M4V. (For Timeline Mode, you can upload any formatted video, and the system will automatically convert them to a workable format.)

If you receive a format-related error message when you upload a video clip, we recommend that you reformat it using the free online video converting tool: https://www.flexclip.com/tools/convert-video/. 

Many video files have the same format but different encoding methods, such as MPEG4 encoding in MP4 format, which may need to be transcoded before using it.