When to enable consumeStream option

When you use a custom plugin activity in the Process Flow and if that activity is consuming a source data stream then you need to double-click on the custom plugin activity:

Go to its properties and set the consumeStream option to True.

For example:

In cases where a source data is being posted to a URL (via http post) or some other manipulation of data is being done by the custom plugin then this property must be set to True.