This version of Unity is unsupported.
Method group is Obsolete

SyncEventAttribute.channel

Obsolete The high level API classes are deprecated and will be removed in the future. public int channel;

Description

The UNET QoS channel that this event should be sent on.

This defaults to zero - the default reliable channel. This can be used to make events that are not essential for game play (such as effects) unreliable.