iTunes 12.9 won't sync media from NAS to iOS devices

Good news!

With the latest Mojave build (10.14.1) the sync issue is gone.

Try!

Quick update: AFP indeed speed things up. It's not as quick as it used to be with the previous iTunes version and SMB, but at least it works.

Same here: After update to iOS 12.1 and Mojave 10.14.1, SMB works fine again.

Same here.

I'm getting very frustrated.

No issues since HS and iTunes 12.8.

My environment is a little bit different but same issues:

I have a MBP 2017 and I have all my music files on a network windows pc.

If I copy files to MBP from the win pc everything works flawlessly.

But when I try to sync music to my iPhone with iTunes I get stuck (iTunes hanging trying to copy files on my phone).

There's something involved in iTunes and smb (MBP seems to lose smb connection during the process)

Anyway, recently I noticed this:

if I use CIFS protocol instead of SMB it seems working as intended, but in some way they are the same protocol so I don't know why this happens.

And the CIFS protocol seems slower.

Demonstrates once more that iTunes isn't guaranteed to play nicely with NAS. A locally connected external drive for the primary copy of the library, with NAS used to hold a backup, may be a more suitable arrangement.

tt2

Yes, this would not work. In my case, CIFS doesn't work because I disabled SMBv1 on the Synology NAS for security reasons.

As far as I know, "CIFS" forces SMBv1, while "SMB" uses the latest SMB version that the server supports (usually v3).

All of these CIFS and AFP are just workarounds, of course. I also wish that Apple would fix this. I am not even sure that they know about the problem, though. If I call Apple support then I will be forced to go through all of the level 1 support loops, such as creating a new user and testing with this one etc. I don't have the time to do this, unfortunately.

Same problem here, no solution unfortunately. Everything else works fine, e.g. Time Machine backup to the Synology is unaffected, a disk speed test shows around 100MB/s read/write with the Synology, and I can copy the affected video files easily to the local machine with regular speed.

Just the sync process in iTunes is ultra slow. It takes several hours to get a 5GB file synced to about 80%, and by then it usually aborts for some reason or another. It doesn't matter whether I sync via cable or WLAN.

Also, while the sync is ongoing, iTunes often freezes for several seconds. Using the finder on the share with the video files freezes the entire Mac for a while.

As you say: Something with iTunes 12.9 must be broken.

As the saying goes, past performance is no guarantee of future results.

tt2

Thx tinue, but, in my case I can't use AFP protocol since my files are on a Windows machine.

Anyway as I said before, for the moment, the only workaround that works for me is to use the CIFS protocol.