Extrude - Internal Loops

There might be nesting faces and internal loops. Try avoiding Up to face or swapping faces in the selection.

Example

Suppose you are trying to recognize the rectangular boss extrude at the back of the model. If you select the lower face for Selected entity and the upper face for Up to next, FeatureWorks cannot recognize the boss extrude because there are internal loops defining other extrudes.

Try selecting the upper face for Selected entity and the lower face for Up to next.