P: Ability to sync Lightroom Classic keywords with the Lightroom Ecosystem

@Peter Chater: I do, yes. 

Thank Jeremy,
do you see this offline search issue as well? You just need to switch on Airplane mode and try a search.

Nah, Adobe needs to tackle this HUGE omission! It’s syncing goddamn strings, not rocket science!

For what it's worth, I've added a feature suggestion to at least warn users that keyword syncing isn't supported. I'd much rather see full keyword syncing, but if that's not realistic then users need to be aware of the limitation 

@Peter Chater: It may be worth creating a new feature request for offline search to cover that scenario. There is another post regarding search capabilities, but it doesn't seem specific to the offline scenario.

Hallo Karl Günter, the missing keyword sync from LR Classic to LR Mobile is one issue, but a much bigger issue is that you cannot search existing keywords when there is no internet connection. Imagine you sit in a beer garden and want to show pictures and it is not possible. Or sitting in the airplane and want to search a picture, again, not possible. OK, the new advanced autodetect scenes need internet, but there are still normal keywords and descriptions. In addition of that, the preview of pictures has issues in offline mode as well. You see only a black preview for many pictures. As son the internet connection is back all these black previews appear immediately. LR Mobile is no longer usable in such situations. OK, Adobe is adding more an more features and I love to see that, but I need the offline functionality as well.
Let us hope the best
Peter

For me one of the most valuable cloud integrations would be synchronized keywords between the Lightroom Classic CC infrastructure and Lightroom CC - because I like to use my tablet at home on the garden deck or sofa to surf the web and then, when I feel like it, I would like to use it to add keywords to images that still didn't get any. So I am forced to sit in a stuffy edge of my workspace which I have set up to have little outside light (so that I get the benefit of correct image display on my main screen) and work on those tags. It really should have been there years ago.

Oh, and I would like to be able to search through my synchronized collections in Lightroom CC - I sometimes do in promptu presentations of some of my images, I would really like to be able to get all my images of say a specific butterfly to show the best of them to someone who asked - currently I have to remember in which collection and approximately where in that collection I may have one of these images.

The lack of these keyword functions currently is one of the biggest omissions in the whole of the Adobe Cloud...

This is certainly a disappointing limitation. But what's especially disappointing is that it's entirely unexpected (since all other fields are synchronized), and there's no communication in the product that this field won't be synchronized.

At minimum, I'd recommend adding a warning to the user the first time they try to edit keywords on a collection synchronized with Lightroom Classic; that would avoid a lot of frustration and confusion as users attempt to troubleshoot why keywords aren't synchronizing (even though everything else is). 

In my case, I spent an hour troubleshooting this before looking online—and realizing that it was "by design".

Update: In the meanwhile there seems to start some kind of caption sync between LR classic and LR mobile, although I did not check that with hierarchical keywords.
But I am happy that captions which I added "on the road" are no longer lost but show up in LR classic

I just feel in the same way.