Seafile Server video player

With the latest 6.3.5 Seafile server, when I share an MP4 video, and open the shared link.

I saw the player control inside my Firefox Browser. but did not open any play window for me.

I remember in the old version 6.1 , the video player always shows a black window inside the Firefox page.

Is there any configuration to change that?

On iPhone, it shows the video player, but no Video Window unless I click the “maximum” icon on the player.

On PC, sometime, it shows the video window, sometime not.