1. Can I use the local video file in the server side to play to all players?
2. Does it cost a lot internet usage when a lots player watching at the same time?

Local files are only visible to yourself and won't appear for other players

I mean putting the video files in the server, is that possible? Or it must rely on internet sources?

but remains visible only to yourself and won't be displayed to other players

The server file path must match the local file path exactly

Looking forward to V3!

Local files are only visible to yourself and won't appear for other players

watermedia topic and was already answered