As to getting more information about the synth that is currently uploading, open the log file with the name of your current synth. (It will have the date and time that you started processing a synth on the beginning of the log's filename to keep multiple log files from multiple synths that have the same name from overwriting each other.)
Once you open the log file, scroll down until you see the phrase 'Synth 0'. This will be your biggest point cloud or photo cluster. Smaller point clouds will follow with 'Synth 1', 'Synth 2', etc. until all the photo clusters have been described. Each photo cluster will list the photos that are included in it as well as their address on your hard drive, so if you were making a synth with images from multiple folders, this is a great way to see which ones matched.
After your synth finishes uploading, all the DZIs, the DZC, and the binary file will all be deleted, once they are confirmed to be on the website, leaving only the log.