-1
Android studio only recognizes the following sub-folders of drawable:
Image size sub-folders:
drawable-hdpi
drawable-mdpi
drawable-xhdpi
drawable-xxhdpi
- In this case, android checks which is the best image format to be able to run on your application installed on the device.
Version sub-folders:
earlier versions...
drawable-V16
drawable-v17
drawable-v18
drawable-v19
higher versions....
- images contained in these version drawable will only be shown on devices with the same API version.
In your case, your JPEG images will only be shown on devices whose API version is 24 as they are contained in the "drawable-v24 folder".