what is the apk file? where is it? Is that the Appery.io app?

I have done that using the Appery Android tester app on my Samsung Android tab3, and as I mentioned it has worked. I am now trying to troubleshoot to regain the functionality that i had previously.

What is apk? Do mean the appery tester app? If so, yes, I have that is what I am testing it on ... and it used to work.

I have shared the app QR Scanner. I have it currently set to open to the page test_barcode_scanner. Please test that on your machine and let me know if it is working.

Samsung Tab Android Version 4.1.2

Still unable to pull up the barode scanner. I created a new page following the tutorial and it does not seem to work. Can I share this with you so you can check to see if it works on your side?