When using the latest plugin and trying to publish to Smugmug, the line appears at the top with "Updating Published Collections" but it just hangs. The plugin was updated in December 2022 and I'm running LRC V12.0.1 on Windows 11
I've noticed that if updating just Keywords, that it works quite well, but if you are uploading new files, then it hangs for hours and may not actually finish.
However, if I right click on the Smugmug Service, select Edit then select SyncNow, it will eventually upload the file albeit after quite a while.
I've attached system info for your reference.