After some trial and error, I worked out how to create an action to create a frame on my images regardless of what size they've been cropped to, but adding a text box within that frame as an action is eluding me as to how to make it centred when the width of each image might be quite different depending on how the image has been cropped, so the best I've been able to do is stop one step short of finishing the action, so the final adjustment to the text box is done manually to centre it. I have 800 photos from an event that all need the same frame, and the same title within the frame, and so creating an action to do all the things these photos have in common is pretty critical with the time I have for PP'ing this many shots.
Thanks in advance for any help you can provide.