So I just tested this with an exported .apk and it's working fine. If you're still having issues, my guess is that it's code related.
I am curious if you had any problems with downloading the test file, because from the yoyo website I still hadn't got the help that I was asking for, and the last reply from them was that they do not know how to download the file
BTW, could you write on which mobile phone have you tested it?
I am very sorry that YOYO, right after finishing the sales ignores their customer