Uploading ENTIRE Music Files

Hi, I'm having trouble uploading music files from my MacBook Pro to my LG G2.
If I want to upload an entire music album, how do I do that? I know how to upload files, but I can only upload one song at a time. Here's basically what course of action I'm taking...

Band Name > Album > Song.

Why can't I just add the entire Album at once? Why do I have to separately click on each song?

Thanks!