I'm a Lightroom/Mac user trying to store my originals on a network volume. It's not a NAS, but rather another Mac on my network that I'm using as a server. This used to work, but in the last couple days has stopped—no matter how I set it up, I get an error in Lightroom saying the remote disk is full. The exact error is, "/Volumes/whatever is full. Please clear some space or change your local storage settings."
If I start with an empty disk or an empty folder on that disk, Lightroom creates the folders it needs to store the originals and then throws the error.
I have tried:
APFS and HFS+-formatted remote volumes
SMB and AFP to connect
Two different Mac running Catalina and High Sierra
I contacted Adobe support. This appears to be a bug in the current version of Lightroom (3.3), and they're aware of it. With luck we can expect a fix at some point. In the meantime, reverting to the previous version (3.2.1) resolved the issue.
To revert, open the Creative Cloud app, and click the overflow menu (three dots) next to the Install button.