Auto save mailing editing template in Mosaico
Changes to the mailing are saved automatically (groups, subject, etc), but changes to the content (i.e. changes that you make in Mosaico) aren't saved automatically. So anything you change while in the Mosaico editor (with the Mosaico logo in the top left) isn't saved. It has always been this way.
It would be great if there was an autosave feature.