The newest beta builds for iOS (Build 3005) and OS X (Build 4519, download here) contain new functionality for Dropshare Sync: Optionally, synchronization of preview images can be enabled. When enabled, you should see preview images in your history for uploads which have been made on other devices.
The compression quality is currently very high, due to the nature of how the synchronization works. We might be able to enhance the image quality in the future, however for now we're interested in how this affects Sync performance.
Let us know what you think.