What Video Formats Does dominKnow | ONE Recommend?

When taking the course assessment, I'm given some questions from each learning object but two of the learning objects show a score of N/A despite answering questions and receiving a score. What does this mean?

We're exploring more about xAPI and have questions...so many questions. We have done the work, using dominKnow, to send data - out of the box and custom statements - to our LRS.  We know we're sending state data, but what we're not seeing is whether content built in dominKnow is also pulling data - such as bookmarking or already visited type of data we'd normally see in SCORM published courses. Is that there and I'm not invoking it correctly?  Or do we have to custom code any pull of the data...