You can copy your files to anywhere you want on your SD Card except the folders generated by the device like
Android, and any other folder beginning with a dot like
.backup. By default, any android device will search for multimedia files in all folders in the SD Card and recognize them using the system's MediaScanner. There is no specific folder, where you should copy to.
So for example, you can create these four folders in the root of your SD Card, and copy your files to them:
- Photos (sometimes people also like to put their photos in DCIM folder)
Of course, you can name these folders anything you want and even create new ones as you like... If it happens that your device couldn't recognize any of your newly added files, just reboot your device and check them again, but that rarely happens.