I have an issue on my Sony Xperia with file

I lost some important changes from my Project file on my Xperia XZ1. I have been working with file during some weeks. And today I've seen, exactly I haven't seen some days of my work. I'm in trouble and I don't know what to undertake.

from DroidForums.net | Android Forums & News http://bit.ly/2pRjtXt
via IFTTT