I think it makes a lot sense for the dropbox link to be the default, especially on mobile. I almost never want to download the file over LTE to my smartphone a

I think it makes a lot sense for the dropbox link to be the default, especially on mobile. I almost never want to download the file over LTE to my smartphone and re-upload it to a different web service and waste (2 * filesize) of my limited mobile bandwidth to share a file.