I have videos taken with Photo on my iPhone
How do I delete them on OS X
I followed this question Deleting photosDeleting photos
Imported to Photos.app, highlight them all and chose delete. I then get a prompt saying they will be deleted from all my devices and confirmed. They are deleted from my Mac but they come back every time I attach my iPhone again i.e. they are not deleted from the device even though OS X says they should be.