Document Cloud Cache Location

Hi.

I use my Adobe account in my Android tablet (Samsung). The last couple of days, when I was trying to open one of my files, a banner appeared telling me that there was not any memory left. However, I tried the same from another tablet and could open the files. Thus, I undeerstood that the problem was not in my Adobe's Cloud memory but in my tablet's memory. Nevertheless, my tablet has plenty of memory left. 

My next step was to try to change the Document Cloud Cache Location from "Internal storage" to "SD Card" but I wasn't able to do it: when I pressed the button, nothing changed.

What can I do?

Thanks.