；iPhone: Video message for more than 5 minutes will fail to send, video within 5 minutes will be compressed automatically.

Android: The original video is smaller than 200M, and smaller than 20M after compression.；

Files limitation is 1G in chatting, no matter one-on-one chat or group chat, by phone or by PC. To upload file to Ding Drive, the maximum file size is 3G by mobile, and 8G by PC.