问题出在.setThumbnail方法中。嵌入中没有加载图像。我总是得到这样的结果：here

const embed = new MessageEmbed()
    .setTitle(song.name)
    .setDescription('Some description here')
    .setColor('#0099ff')
    .setThumbnail(song.url); // <- not working
message.channel.send({ embeds: [embed] });