Here are simple steps you need to follow for uploading an image or video to the emulator gallery in Android Studio:

Make sure your emulator is running.

1.Go to View > Tool Windows > Device Explorer. It will open device explorer window.

2. Find sdcard option.

3. Go inside sdcard option. Find DCIM. Right click on DCIM and click upload.

4. After clicking on upload button, you will able to select any picture from your computer or laptop. It will successfully saved in you gallery.