Video In Video Pop Up Close and Resume

Exploring Captivate for a specific project that requires a base video presentation (slide video A) with overlays along time line that will pause A, show video (object video B), and when (B) is exited, return to (A) and resume from Pause. Having issues closing (B) and resuming (A) via Advanced actions and a button (for user to clear (B) without watching.  Currently on a trial version.. any feedback welcome.