MMS content files sizes should be below 500kb:
  • Single images should be .jpg format, at least 640x480
  • Ringtone (aka audio files) should be .mp3 format for Android handsets and .m4r format for iOS
  • Videos should be .3gp format
  • Animated GIFs should be .gif format
Any file that exceeds 500kb and is not formatted as listed above will fail to upload.