If you haven't started using animated gifs in your emails to customers, you should. It's the best way i have found to standout in the sea of other emails.
Here is how I make GIFs on my phone.
Recently we have been using the GifBoom app:
Google Play: https://play.google.com/store/apps/details?id=com.tapmojo.gifboom&hl=en
Here is how we use GifBoom: