Android Studio Profiler Memory Allocated N/A

I had the same issue and here's what I did to make it work. (This is effective when running on API level < 26 only)

1. In Android Studio, go to the Configurations menu as shown in the image below and click on Edit Configurations.

2. Select your app configuration from the menu on the left (usually called "app").
3. Click on the Profiling tab.
4. Check "Enable advanced profiling".

1. Enable advanced profiling. (If this solves the problem ignore the rest.) Edit configurations > app > Profiling > tick "Enable advanced profiling"
2. In Android Studio, open the profiler view by clicking the profiler button.
3. At the top of the view pane, to the right of "Sessions" click the dropdown menu and select "Memory".
4. To the right of the dropdown menu that now says "Memory" you will see "Allocation Tracking" and a dropdown menu next to it. Click it (while profiling!) and select "Full".

I hope this helped you.

EDIT: How my answer is better: It works on all Android devices!