Idea is great but it need properly designed app and this one is not.
First of all main issue is quality of sent photos. Quick test shows that even without cropping max height or width of sent photo is 800px - even lower that physical resolution od ZOOM.ME. When you decide to crop its even worse - whole process is made on image already scalled down to 800px. So it takes your beautiful, high quality photo from iPhone, scales it down to 800px, saves as JPG 92 quality, and then performs cropping, saves again as JPG 92, which gives in result even lower resolution and quality. This is mayor design flaw which produces very visible lack of quality of sent photos.
Second thing I dont like is that prepared images are saved in roll with any other photos - they should be put in separate folder/album to avoid confusion from user.
Third - its not swift as stock apps for example, for sure a bit work will make the difference.
I hope above issues will be adressed in future updates.