Our iOS mobile app for the newest DJI devices will have a utility to ensure that all the appropriate images have been taken. It won't process them in the field but it will at least show that you have everything you need to create a good map successfully. We don't feel the need to release software similar to the many client softwares available for doing a preview stitch. The free versions of Agisoft and Pix4D will do what you are looking for on a minimal machine. If the images work on their software, they will work on Maps Made Easy.