I heard the announcement about the door opening and saw - what I assume to be - live images from the inside which showed the door first opened, then closed so it seems that test worked.
Scott Manley seems to believe that there was some kind of malfunction with the doors[0]. I couldn't really tell from the video, but he certainly knows a hell of a lot more in this domain than I do. He does agree that overall the test was highly successful though.
Here's an evaluation of things going wrong on the flight by three 'Youtube space flight watchers' (Fraser Cain, Scott Manley and Marcus House) including possible mishaps with the cargo door:
