Yeah i came across with the same problem. I know how you're feeling, it's so frustrating. Here where I live(Turkey) the upload speed is max 1 mbps on adsl modems and i think the site is optimized to the average upload speed value of 20 mbps UK/US. So I don't know where you live but i believe our problem may be common. if your upload level is lower than the average like mine, the uploading process times itself out when it can't read any high values and stucks itself. I couldn't actually managed to find a solution to that tbh. My zips were like 200mbs each and I tried over and over again till it eventually managed to upload all. Try picking one by one rather than selecting all of your archives that helps preventing upload traffic as well. Hope they fix the issue soon. Well it's not an issue for me actually it's just my country's bad upload speed lol. Lets say hope they optimize the system for low upload speed systems :)