Android Studio doesn't recognize my device

Question

Here is the problem. I want to run my Android Studio apps on my device (Samsung Galaxy Ace 2). But nothing works for me. Tell me what I\'ve missed:

1) USB debugging

Answer 1

I had a big problem with my Samsung S10 Plus as it was not detecded by Android Studio on my Macbook even if I did all what is required to be detected, that is to say:

1. Enable developer mode (7 taps on Build version in Android settings)
2. Enable USB debugging

What I did is to start "Android File Transfer" on my Macbook and the magic happened. A popup appeared on my device asking if I want to authorize an USB access to it. I clicked "Yes, always" and now Android Studio can detect my device on my Mac :)