The latest x86 version of spotify requires media-video/ffmpeg:0.10 to play local files, if it not installed spotify will list files but will not play them, and will not give any alert. It looks like spotify will not sync local files on mobile devices. Once the library is installed the local files are played without any problem.
rather moot, as upstream doesn't provide a download anymore: --2015-06-03 18:58:30-- http://repository.spotify.com/pool/non-free/s/spotify/spotify-client_0.9.4.183.g644e24e.428-1_i386.deb Resolving repository.spotify.com (repository.spotify.com)... 54.230.196.188, 54.230.196.147, 54.192.197.91, ... Connecting to repository.spotify.com (repository.spotify.com)|54.230.196.188|:80... connected. HTTP request sent, awaiting response... 404 Not Found 2015-06-03 18:58:31 ERROR 404: Not Found. !!! Couldn't download 'spotify-client_0.9.4.183.g644e24e.428-1_i386.deb'. Aborting. * Fetch failed for 'media-sound/spotify-0.9.4.183-r9', Log file: * '/var/log/portage/media-sound:spotify-0.9.4.183-r9:20150603-165830.log' * Messages for package media-sound/spotify-0.9.4.183-r9: * Fetch failed for 'media-sound/spotify-0.9.4.183-r9', Log file: * '/var/log/portage/media-sound:spotify-0.9.4.183-r9:20150603-165830.log' * * The following package has failed to build or install:
'fixed' removed inaccessible source file.