Animoto uses an adaptive bitrate system to create smaller downloads. In most cases, this is ideal since it makes it easier to post your video. Sometimes when sharing to Amazon, it doesn’t recognize that this is an adaptive bitrate so it registers a smaller size and causes an error message.
You can easily fix this by manually transcoding your videos to MBPS or more before you upload your video to Amazon. Once you change the bitrate, you should be good to update your Amazon video!