I'm not sure as to what happened specifically but the files uploaded perfectly this time. A bit slow (blame my internet speed) but it worked out in the end. I'm not sure what happened but everything seems to be working fine now.
If ever anything happens again, you guys will be the first to know.
Sorry for the inconvenience!
Hopefully this won't happen again in the future.
PS: I use Google Chrome as my main browser and Adobe Photoshop CS6 for file editing.