Flow links allows you to connect pieces of flows without a direct connection. Use cases are:
This is done by having a “Flow Links Send” element with a specific value for the “Channel“ property. When a job arrives in a “Flow Links Send” element, then the App will send a notification to a “Flow Links Receive” element which has the same value for the “Channel” property. The Receive element will then move the job from before the Send to the Receive element, including metadata and datasets. This way you can move jobs from one place in the flow to another, or to different flows.
It is also possible to add metadata in the Send element, similar to how the Data Mapper app works.
Flow link is a very useful tool to make complex flows easy, as it was its predecessor.
The most valuable feature is the ability of adding metadata ("private data" can be used even if you don't have the Metadata module) but it lacks of flexibility: the scope is not selectable and links go over your whole list of flows on Switch.
It would be nice to have the ability of setting a "Flow" or "Switch" environment the link have to work in.
Flow Links works perfectly and simplistically and without the need for a middle-man folder on my local drive.