Hello, send video within 20M to chat is allow to watch. And it support for multiple file preview, it is more convenient to view the file.

The video will be compressed depending on your mobile device:

iOS：The video message which longer than 5min cannot be sent, and the video which within 5min will be compressed and send to chat or upload to DingDriver.

Andriod：For the size of video messages, the original video have to smaller than 200m, and also have to smaller than 20m after compression. The video and file within 2G can be upload to Ding Driver.