7 to 8 sentence summary should be the intended meaning. If that's paragraph or pages, then it wouldn't be a summary.

Hi Hannah, I agree with Lan. Also, it should be “a summary OF what you watched”.

What exactly is this sentence supposed to be about? What is 7 - 8 summary? Then I can answer your question. :) Also correct question would be: Which option is better? :) (Without the IT part)