GRAND Flagllery and GRAND Media Gallery (Gmedia) are different plugins.
As you can see Gmedia plugin is in beta (I've wrote this in plugin description) and not all functions working properly, especially if some folders haven't write permissions :)
I'm building website for this plugin, so there will be more information on how to use it.
The Gmedia plugin installs in 'wp-content/plugins/grand-media' folder, but all uploaded files should be in separate place: 'wp-content/grand-media' folder with chmod 755 or 777
Folder for images: 'wp-content/grand-media/image'
Folder for mp3 files: 'wp-content/grand-media/audio'
and few more folders for other file types and assets
As for now there is only two modules for creating image galleries in Gmedia plugin. But I'm working hard to add more modules also for music and video.
Gmedia is the media library/gallery plugin which will be more powerful replacement for Flagallery plugin. Don't panic, I will support both plugins (Flagallery is one of the most popular gallery plugin).
If you want play music on your site you can do it with Flagallery plugin:
1) Upload music to WordPress Media Library
2) Go to Flagallery -> Music Box
3) Choose mp3 files -> choose 'Create playlist' from actions drop menu and click Apply
3) Copy shortcode (should be like
[grandmusic playlist=foo]) of created playlist and paste it in the Post
You can also copy single mp3 shortcodes (e.g.
[grandmp3 id=123 autoplay=false]) on Music Box page and paste as many as you want to your Page or Post.