"Previous trailers" refers to the trailers or previews of something, such as a movie or a game, that have been released before a certain point in time. It means the trailers that came out earlier than the most recent one. Full definition
As hinted in previous trailers, the latest installment will be jam - packed with action, which means epic fight scenes and much more. (highsnobiety.com)
While there are quite a few shots from previous trailers and footage, there is a lot of new content in this teaser. (screenrant.com)
There have already been two previous trailers released, so why not one more to push this film. (firstshowing.net)