cannot disable s3 storage

Hi,
I would like to store audio files locally on my wordpress site. In the text to speech settings page, I don’t get a checkbox to enable media library and it says that local storage must be enabled. If I uncheck S3 and hit save, it is checked again when the page refreshes and I still can’t enable media library. What am I missing here? Is there another wordpress setting I need to change in order to get this to work with media library?