Saving Files with Background Upload
To ensure that users are not blocked in their application, watinig for the files being saved to be fully transported to AEM server, the saving operation saves files locally first (caches internally, so that it's invisible to the end user), and only then starts background upload to the AEM server.
This provides with a better user experience (local save might be much shorter, especially with large files and/or slow network connection with AEM), and ensures that file versions are handled cleanly by AEM - even for applications, which save files in smaller chunks.
Uploading Folder Hierarchies in Background
Hierarchical / large folders can be uploaded directly from the AEM UI now, leveraging the new Create > Upload Folder option, that calls the Desktop App to execute the upload in background. The upload process can be monitored using Desktop App upload monitoring dialog.