The file name has no bearing on what appears on the iStock website. It is only how you fill in the form along with the file that matters. I think time is well spent carefully making a title and description. But I do suggest that when you upload, you keep good track of your uploaded filename and location with the iStock number you are assigned. After some time, it will be hard to get back to that file from the iStock info and you may very well need to. I create a thumbnail in the same diretory as my original uploaded image, and name it with the istock image number.

