1. You received 10 points after you have uploaded 1 file to the gallery.
2. You will receive 30 points once you have uploaded 1,000 files to the gallery. The progress bar shows the no. of files you have uploaded so far. Since 1,000 - 342 = 658, you need to upload another 658 files to get the 30 points.
3. You can click on the small blue arrow to view the dropdown.
4. Those are name & gallery links to your files that have been selected as featured.