downloadMessage method
下载多媒体消息
Implementation
Future<V2TimCallback> downloadMessage({
required String msgID,
required int messageType,
required int imageType, // 图片类型,仅messageType为图片消息是有效
required bool isSnapshot, // 是否是视频封面,仅messageType为视频消息是有效
}) async {
return await ImFlutterPlatform.instance.downloadMessage(
msgID: msgID,
messageType: messageType,
imageType: imageType,
isSnapshot: isSnapshot,
);
}