All my photos and presets are gone

Please, I need someone to help me.

This week my Lightroom Mobile version stopped working and started crashing. (I have the free mobile membership for an android system)

As I could not open it and the only option I had was to erase it, I deleted it and downloaded it again.

I did not know that this step made all your pictures get lost.

I really need to get them back if possible because they are part of my work.

The SD card and the phone´s storage said the app had a sized of 1.4gb, therefore I have the illusion that all the files were still somewhere, but now it says it weights 159mb. 

Before formatting the SD, I need to know that nothing else can be done. Please, I would REALLY APPRECIATE your help!!

Thanks, 

Sol