After I process my images I break them down into folders of 10, 20, etc...pick a number good for you. I go with the number that is the minimum I can submit to any of the sites per week. So if my minimum is 20, then that is the size of the folder that I will upload. I use only FTP and upload to all the sites at once. After all the batch of images have been uploaded to each site, then I move those images to a complete folder. I log into each site respectably and submit. I don't keep track of who accepts what and who does not sense I know the whole batch was uploaded to each site.