Subscribe allows you to read in data into your DataSync Express instance, notably to synchronize your instance with another instance that is sharing data as well as receiving information back from your DataSync Agent when it runs into issues.
To use subscribe, you must first specify a subscribed queue.
Global subscribe is a Subscribe definition that when created, will allow all incoming messages to be subscribed. If there is an existing subscribe definition for a specific table, its definition will override the global definition.
NOTE: Because of scope app limits, subscribing to table records into ServiceNow (i.e. subscribing to records bulk shared from another instance) is limited since features like Run business rules and Override system fields are not supported due to cross-scope access policy restrictions. This would require manual changes to each table to support subscribing properly and is something that we continue to research further.