Improving quality of recordings to cloud

We livestream our classes using an ipad and also record them to the cloud.  While our ipad on it's own (outside Zoom) as great resolution and audio, when we go through Zoom, it's grainy and warbly at times.  (It seems like it's worse than it used to be, although we haven't changed anything on our end.)  Does anyone have any  suggestions as to how we might improve this ...?