I cant send back-up thru email?

I have been using this app ever since I started studying Japanese, very helpful and handy and this app was recommended by sensei before I took up my first basic course.

The only problem I encountered right now is sending a back-up file thru email. I have been doing that for so long but this time I wont send it thru my email. I want to update my 2 iPads with the lists on my iphone but I wont work.

Im not sure maybe because of iOS compatibility, because I recently updated to iOS 9, I do hope you could fix this problem or make an update for this app.

Once again really awesome app and keep improving this app more! More power guys!

Efren about imiwa?, v4.0.1