AVD = Android Virtual Device
This video shows the steps to put any file in the download folder of your Emulator/ Android Virtual device running in Android Studio. This same concept can be user to put the file in any other folder or read files from any other folder.
File Dragged and dropped at Download folder:
Emulator path in windows explorer:
Any files uploaded in the emulator/ virtual device forms the part of the image files in the above path. Those image files can’t be read independently outside the Android Studio environment as those are encrypted form.