I'm having difficulty getting the asset preview thumbnails to appear. I've narrowed it down to a permission issue. I'm running Adapt Authoring as a server in a Win 2016 server. When I have the service run under my administrator account, the asset upload works fine. When it runs under the local service account, the asset is saved to the assets folder, but the thumbnail isn't. I've tried giving "Everyone" write permission to the folder but that didn't work.