Sync deleted pictures between the gallery and Dropbox

[AC Question]

Hi there,

Whenever I take a picture, the gallery gets synced with Dropbox. That's great, but when I delete a picture from within the gallery on Android (not in Dropbox), the picture isn't removed from Dropbox, and I need to manually delete the picture there. How can I set up an automatic sync between the gallery and Dropbox when deleting pictures so that I don't have to delete the same picture twice on two different locations?

Thanks.