Where do files go?

Create the category (artist) and product (album) and MyMuse will create the directories.

Then you can upload through the Edit Tracks page one at a time, or by FTP.  If you are using Amazon S3, go and upload all your files. Files uploaded by FTP/Amazon will show up in dropdowns in the Add/Edit Tracks screens.

Previews: Previews can be uploaded through the admin pages or by FTP.
By default the preview_dir directory is images/A_MyMusePreviews. You can change that in Components->MyMuse->Store: Download Options. Files are placed in subdirectories depending on the Artist alias and Product alias.

The Preview directory will be:
Preview_dir/Artist_alias/Product_alias/  ex: /var/www/html/mysite/images/A_MyMusePreviews/neil-young/tonights-the-night

If you set the option "Previews all in one directory" in the Store, put them all in that directory.

Downloads: The Main file for sale, also called the payload, can be uploaded through the admin pages or by FTP.

The default download directory is  /path/to/your/site/images/A_MyMuseDownloads/. You can change this in Components->MyMuse->Store: Download Options. Depending on your server configuration, you may be able to place this outside your web directory. This would be the safest for guarding against direct downloads.

The default is to place files in subdirectories depending on the Artist alias and Product alias.

Download_dir/Artist_alias/Product_alias/

You can also choose the option "Download Directory Type" to be "By Format". For example, if you are selling mp3's and wav's the diretories could be

Download_dir/mp3
Download_dir/wav

If you upload all your files the file names will appear in a drop down in the tracks add/edit page.

For security, if using apache web server, and your download files are within the web directory, confirm there is a file .htaccess at the top of the download directory

download_dir/.htaccess

The default is:
images/A_MyMuseDownloads/.htaccess

This should stop direct downloads of files.
If it is not there, you can copy it from administrator/components/com_mymuse/assets/htaccess.txt -> images/A_MyMuseDownloads/.htaccess

Graphics: MyMuse creates a directory called images/A_MyMuseImages but you can put category/product images wherever you like.