If using WPAssure with the S3 plugin it looks like there's an edge-case issue where it redefines the S3 classes and causes a fatal error in some hosting environments. For example, on our 10up Managed Hosting the S3 plugin is installed as a drop-in plugin, which is also installed via composer as a dependency for WP Assure. The two conflict since neither is checking for the existence of the classes/functions before using and error out.
If using WPAssure with the S3 plugin it looks like there's an edge-case issue where it redefines the S3 classes and causes a fatal error in some hosting environments. For example, on our 10up Managed Hosting the S3 plugin is installed as a drop-in plugin, which is also installed via composer as a dependency for WP Assure. The two conflict since neither is checking for the existence of the classes/functions before using and error out.