Macbook pro trackpad not working to select portions of a clip in iMovie
I'm using my macbook pro with Big Sur 11.1 installed and using iMovie 10.2.2. I was able to select a portion of a clip in the browser using the r+click+drag on my track pad and it was very glitchy and finicky but I could get it to work up until yesterday. When I press and hold 'r' the small yellow box appears and only sometimes the larger yellow box appears with the handles. but when I try to click and drag the handles, nothing happens. So I can't select any portion of the clip! Any suggestions?
MacBook Pro 13″, macOS 11.1