UNRELIABLE! Worst communication app ever. Some features appear and disappear at will, e.g. reactions. I am occasionally able to send notes because this feature also often becomes unavailable to me. Sometimes only video and audio responses are possible. Video quality is OK, but audio often exhibits microphonics. I am sporadically able to send files, pictures, etc. My contact list often disappears, too. It is one of the most annoying apps. I am puzzled by Google's quality standards?!