Android Studio doesn't use images from all dpi folders

I'm developing an android app and I have a custom layout that I need to support for all the screen sizes. for that I created images and placed them in different dpi folders (mdpi to xxhdpi)!. But Android Studio uses only the resources from one dpi folder for all screen sizes on actual device as well as emulators.

Please tell me what to do? app launch is to be done in few days.

how it looks on Moto G2

how it looks on Nexus 7

thanks in advance!