I have uploaded files to the server, but Alive Media Player does not show them up in the playlist.

If you set folder or single file as media source for the player, it will read data about your files from the DNN database. If you upload media files through DNN's File Manager, you shouldn't have any problems.

But, if you upload your files via FTP, or some other way, you will have to synchronize file system and database.

Please go to your portal's File Manager:

• Admin -> File Manager -> Synchronize Files (Recursive).

You should also check if you have .flv MIME TYPE enabled on your server.