After updating macOS to Sequoia Version 15.6 (24G84), I noticed that I cannot interact with the Finder from any other Applications. For example, I cannot export files from Photos.app, I cannot upload files to Google Chrome or Safari, I cannot exclude folders from TimeMachine when backup the computer. Whenever I click on the uploading or exporting or excluding box, there is a spin of the colorful ball, and after about 10 seconds, nothing happended.
I got really frustrated, and was almost ready to downgrade the whole system back to an earlier version. After doing some search (AI answer did not help), I found this one solved my issue: https://apple.stackexchange.com/a/474043/
Essentially, I just need to remove the cache of FileProvider (the name makes sense now after came across with this issue).
rm -r ~/Library/Application\ Support/FileProvider/*
Then restart the Applications, and it now can interact with the Finder file system!!! Saved me a day.
And, btw, we have finally arrived at Madison, WI yesterday. I may can write a short blog post about the whole process later.
Calendar Sync
It has bothered me for a while that the Calendar on my mac does not sync all the things on my work outlook calendar. I tried to make sure the outlook exchange account is logged in, still did not sync. Then, I learned to restart the exchangesyncd process: open Activity Monitor, find the exchangesyncd process, and force quit it. It will restart automatically, which resolved the sync issues!