Video: mp4 is most preferable, we encourage you to convert your videos to this format (mkv, mov, m4v, webm, matroska and quicktime are also acceptable).
Audio: mp3, wav, m4a.
Photo: jpeg, png.
Font: ttf, otf, woff, woff2.
There are some other limitations:
Video duration: min 3 seconds, max 5 minutes.
Video size: Max 1GB.
Audio duration: min 3 seconds, max 5 minutes.
Audio size: max 50MB.
Font size: max 20MB.