I'll have to use imgur for my mods until I run out of room.
Question, though; you have in the picture that "Dropbox is preferred" for uploading files; are OneDrive and Google Drive also allowed, in addition to Dropbox and MediaFire, or no?
Yup they are allowed...
only websites that are not allowed here are:
websites which requires you to subscribe in in order to download the files.
websites with adds, adfly for example.