Yeah, I was starting to think your versions are different, not mine
I asked why I only had access to Album Settings on the web version and Victoria answered "Some of the sharing settings are only currently available in the web interface", so seems to be normal operation.
A bit more experimentation and I discovered that:
If I originally created a Synced Collection in Lr Classic and then access it in Lr CC, I find that it's Sync Status is shown in Lr CC to be: Cloud = Smart Preview Only
BUT . . .
If I originally created a Synced Collection in Lr Classic and then access it in Lr CC, I find that it's Sync Status is shown in Lr CC to be: Cloud = Original Backed-up
Digging around my HD, I then discovered:
ACR Cache = 366 MB
but . . .
Lightroom = 35.55 GB
Lightroom CC Saved Photos = 15.04 GB.
(These seem to be the local back-ups of the originals and trashing the contents of this folder doesn't appear to affect the operation of Lr CC)
Lightroom Library = 85.41 GB. (I believe this is only for Lr CC?)
Taking-up 100 GB on my laptop's 500 GB HD is not acceptable!
And this is all in addition to the space occupied by my original files on my networked HDs.
Wait a second, you said the same thing twice!
But I think you meant Creating a collection in LR CC = The original gets backed up to the cloud. (?)
That is my experience.
Yeah I don't understand why LR CC makes a duplicate of the files, even when the originals are stored locally on the same machine. I did read somewhere that LR CC will delete these files if they have not been accessed in a while, maybe they expect that we will be deleting the files locally and only keeping them in the cloud so they hang on to some files for faster access(?) Maybe that is why we can change the amount of local storage space that LR CC will use(?) Either way it seems like an oversight and is a complete waste of hard drive space if the file is stored on the same hard drive twice. I asked, I'll let you know if anyone answers.
I don't see myself using LR CC except to cull images when I'm away from my desktop running Classic.