Whenever I try to permanently delete a photo album from the ipad by clicking the “trash icon” in the AnyTrans app, it says “Deleting, please wait a moment” for a minute than I get the error message “Sorry, you cannot delete photos on album due to device system limitation issue.  Please use AnyTrans App to delete them on your phone”. 
(1) I’m already running the AnyTrans App on my imac to delete them.  So what’s the “AnyTrans App” this error message is referring to?
(2) What is the system limitation issue it’s referring to?
(3) How can I delete albums that I’ve already transferred to my imac?
(4) This is on my ipad, not a phone.