Keynote with Dropbox/Box/Gmail

The new Keynote creates files that look like a single file on a Mac, but on other machine appear as a folder with multiple files in them. This has implications for online file sharing:
  • Gmail: emailing a Keynote file as attachment does not work
  • Box: file syncing, or sharing a download link does not work
  • Dropbox: seems to have fixed the issue.
Has anyone had issues or is it just me?