Great app but one big issue

Everything works fine but for some reason i cant save sketches anymore. I recently switched to an iphone 7 and Whenever I try to send the sketches I drew it only shows a white frame on the timeline. Looks to me like the app isnt optimized for iphone 7 or ios10 so I hope this will get fixed soon.

prinzfrederik about Couple - Relationship App for Two, v1.10.2