I'm pretty sure this can be implemented without forcing the user to make any choices they wouldn't have to make anyway. For actions like share and pick, the use

I'm pretty sure this can be implemented without forcing the user to make any choices they wouldn't have to make anyway. For actions like share and pick, the user will want to choose which service to use. For view and edit, they may not care, so there should be a default choice, either by the user or the originating site.