The filter would not go all the way in
I found this Youtube video: https://www.youtube.com/watch?v=nEvf-0qj9gQ&t=10s
That helped me get all the fluff out of the cavity.
Then I was able to put the filter back in. But it had been damaged at the top, so still caught on clothes a little, even when fully in. So I bought a new filter and now it is perfect