Imported music from iTunes for Windows not appearing

I saw that, but with all due respect, I am deeply skeptical. I have used wipe/restore techniques for many kinds of software issues and their track record, I find, is somewhat spotty. The reason is that the data corruption that led to the problem in the first place can often still be there in the backups and thus the problem often persists after a restore. On the other hand, when caches are involved, clearing them and letting the software recompute the cache is a family of techniques that almost always works.

Looking again at the "delete the music" strategy, I noticed that even after deleting it, over 800MB of data was still associated with Apple Music. Persistent cache? So I just deleted the Apple Music which claims it will wipe all (local) files. I'll have to try reinstalling and resyncing when I get home tonight to see if this worked. Fingers crossed.

Alas, that did not work. The UI in current version of iOS is a little different, deleting all the music isn't an option until you've deleted all artists listed, which was (fortunately???) just a small subset of what was really there. But then finally I could delete everything. Reset Warnings button on iTunes, tried syncing again. First time, instantaneous. Nothing. Second time, a handful of CDs appeared to sync. Several more times, finally seemed to be actually copying files. But nope,still not there. Other suggestions, anyone?

I am quite startled to see that this problem has been plaguing people for multiple years now, with most reports failing to be resolved. Not reassuring.

Thank you, that's very promising -- I'll try it tonight when I can resync with the iTunes machine. If this works I guess I should avoid updating Apple Music on the road. Sigh.