trackpad not working in email attachment pop up window
I've tried both gmail and outlook email platforms. When i click "attach", then "browse this computer" a pop up window opens to allow me to choose the file i want to attach. At this point the trackpad is not usable. i can scroll the immediate list with the arrow keys, but I am unable to properly access all folders vie arrow keys. I took a look in trackpad settings and couldn't find anything associated with this problem. Please help! Thanks
MacBook Pro 14″, macOS 12.0