I have around 3200 songs in my library and not all of the albums sync, its says in library that its on my phone but when I search for the song/album, it is not there. I have tried multiple times to delete all the songs and re sync to but has worked
MacBook Pro TouchBar and Touch ID, iOS 11.4.1
If some of your music in your iTunes library is not syncing with your iPhone or other devices, before changing your settings or uninstalling and reinstalling iTunes, you can check one thing in your music library which can tell you why iTunes may not be synching all your songs to your device(s).
One reason that iTunes may not be syncing all your music is because iTunes may not be able to locate some or all of your music. To check this, open iTunes and go to your music library. View your Song list. If you scroll down your list of songs and see an “!” in front of some of the songs names (see screen shot below), iTunes can no longer locate the actual song file. What this indicates is that at one time iTunes knew where these songs were and for whatever reason the song files have moved (or have been deleted) and iTunes can no longer locate it.
If you think that the songs marked with exclamation points can still be located somewhere on your hard drive, you can update their file path in iTunes if you perform the following steps:
If you know the location of the track with a “!”, point iTunes to it and try to play your content.
If you don’t know the location of your missing track, use the Windows File Explorer that opened when you selected Locate and use the Search box in the upper left of Explorer to search for your missing song. Be sure to do the following:
Explorer will search for that title. Once you locate your missing song, the “!” for that song should disappear and you can play it within iTunes.
Once iTunes identifies your missing song, if it sees other songs in this location it will ask you whether you want to link those other songs to your iTunes library. If you say “Yes”, iTunes will take a few minutes to catalogue your missing songs (depending on how many songs are involved). After iTunes finishes, any “!” in front of a song iTunes has located should disappear.
If your missing songs are in different locations, you may have to perform this process several times to locate all your missing songs.
Once iTunes knows where all your songs are located, all your songs should now be available for syncing with your device(s). You can then sync your music library with your device(s).
If some of your music in your iTunes library is not syncing with your iPhone or other devices, before changing your settings or uninstalling and reinstalling iTunes, you can check one thing in your music library which can tell you why iTunes may not be synching all your songs to your device(s).
One reason that iTunes may not be syncing all your music is because iTunes may not be able to locate some or all of your music. To check this, open iTunes and go to your music library. View your Song list. If you scroll down your list of songs and see an “!” in front of some of the songs names (see screen shot below), iTunes can no longer locate the actual song file. What this indicates is that at one time iTunes knew where these songs were and for whatever reason the song files have moved (or have been deleted) and iTunes can no longer locate it.
If you think that the songs marked with exclamation points can still be located somewhere on your hard drive, you can update their file path in iTunes if you perform the following steps:
If you know the location of the track with a “!”, point iTunes to it and try to play your content.
If you don’t know the location of your missing track, use the Windows File Explorer that opened when you selected Locate and use the Search box in the upper left of Explorer to search for your missing song. Be sure to do the following:
Explorer will search for that title. Once you locate your missing song, the “!” for that song should disappear and you can play it within iTunes.
Once iTunes identifies your missing song, if it sees other songs in this location it will ask you whether you want to link those other songs to your iTunes library. If you say “Yes”, iTunes will take a few minutes to catalogue your missing songs (depending on how many songs are involved). After iTunes finishes, any “!” in front of a song iTunes has located should disappear.
If your missing songs are in different locations, you may have to perform this process several times to locate all your missing songs.
Once iTunes knows where all your songs are located, all your songs should now be available for syncing with your device(s). You can then sync your music library with your device(s).
You could try the following all-purpose steps for dealing with erratic device or sync behaviour (including the troublesome greyed out tracks and/or dotted circles of stalled transfers). They assume that all of the content you want on the device is in your library ready for restoring. If it isn't see Recover your iTunes library from your iPod or iOS device first. I would also recommend you copy everything out of the camera roll if you haven't already.
Use an encrypted backup (*) if you want to preserve passwords, Wi-Fi settings, web history and health data where appropriate. I also suggest syncing with a selection of playlists (unless you're using iCloud Music Library) rather than manually adding content as, if nothing else, the process above is easier to do if you ever have to go through it again.
(*) The downside with backup encryption is that if you forget the password when you need it again, which could be years later, you may need to invoke a workaround to turn off encryption as shown in Disable iOS backup encryption, which can only help if your device is in a state that can backup to iCloud, or runs iOS 11.
For added security you might also want to make an independent backup to iCloud and/or archive your current backup before you start.
FWIW I successfully used this method some time ago when Siri became unable to call contacts or play my music.
tt2
I have found that sometimes songs may get grouped into an "Unknown" category on your device unless the album compilation flag is set correctly in your iTunes library. Perhaps this article will help:
Not all Songs Syncing from iTunes library to iPhone 7
