Not blind, it is on purpose. The drawing holds no device data. After you save it, you attach it on the device’s (or the site’s) Views tab and connect each symbol there with Edit symbols. That way one drawing can serve many stations and each keeps its own connections.
Shortcut if you control the firmware: keys named <symbol id>.<field>, for example pump1.running or t1.value, connect by name without any clicking. Binding symbols to live data