setThumbnail method
Set the thumbnail field and return this
final embed = EmbedBuilder()
.setThumbnail(url: 'https://..../images/my_picture.png');
Implementation
EmbedBuilder setThumbnail ({ required String url, String? proxyUrl, int? width, int? height }) {
thumbnail = EmbedThumbnail(url: url, proxyUrl: proxyUrl, width: width, height: height);
return this;
}