In the past few months, Samsung has been pushing for an Android 10 based oneui 2.5 update. This update enables gesture navigation to be compatible with third-party launchers, and adds support for dynamic photos with sound. But there's a problem with this feature for users who store photos on Google photos: dynamic photos uploaded to the service are displayed as still images, while video and audio are stripped out.
It may be that a recent update to Google photos introduced a bug that affected the upload of dynamic photos. Samsung's motion pictures have been around for a while, but Google photos didn't support them until last year.