Dropbox is no longer supported
Unfortunately, after many months of trying, we've come to the conclusion that we're not going to be able to support Dropbox integration any more.
All is not lost!
In the meantime, we'd like to encourage you to take a look at some of the other options for getting code in and out of PythonAnywhere. Think of it as an upgrade! Switching to a VCS-based system that uses Github or Bitbucket offers many advantages in terms of reliability, backups, and the-way-real-software-engineers-do-it-ness...