When uploading files from a directory or Flickr album with large number of files (like this one) it is hard to keep track of where you are in the list, what was already uploaded and what still needs to be. Current upload form allows 50 uploads at a time so I would propose to place a vertical line separating batches of 50 files on the page, maybe even with numbers: 50, 100, 150, etc. Alternative approach would be to just place a number next to each icon.
If number of uploads is raised as suggested in T135085. I would still keep either the numbers or dividers every 50 or 100 files.