A Series MMSs have a Pictures share for photos similar to the Music share for music files. The Pictures share is also where the sample photos are housed (you can delete these at your leisure). The Music share is for content you'd like to add to the server manually without any synchronization client. It can be deleted at any time, at your leisure. Content stored in these shares is accessed in place and is not pulled into the MMS's internal file system so any changes you make to files stored there are detected by the server within 20-30 seconds and the internal database is updated.
To access these shares from Windows:
Open My Computer
In the address bar, enter \\192.168.1.214 where you replace that IP address with that of your server (you can also use the name of the server, i.e. \\MIRAGE-1 or \\MMS-2)
Open either the Pictures or Music share.
Copy the content of your choice to the appropriate share as you would any other file.
To access these shares from Mac:
From Finder, open the Go menu
Select Connect to Server....
In the server address field, enter smb://192.168.1.214 where you replace that IP address with that of your server. You can use a name as with the Windows instructions, but I do recommend using the IP from Apple devices, as they seem to have some difficulty handling local DNS resolution
If prompted for credentials, please select the Guest option
Select the share you would like, and copy the content of your choice to the appropriate share as you would any other file.