There is a known problem for those using Mac Safari with hanging or breaking transfers. Very simply, your file gets stuck during the upload anywhere between 0% - 99%.
If you run into this issue, the best workaround for now is using another browser like Google Chrome or Firefox.
Are you using a different browser or operating system and are you encountering the same issues? Then we might have a couple of other suggestions for you to help with your transfers!
Transfer still stuck after checking out these suggestions? Send us a ticket so we can help.