Files/directories have the blue syncing symbol against them , and the cloud station drive keeps saying preparing
Update
Cloudstation has updated - now the log files reside in /volume1/@cloudstation/log
There are 2 methods to see or track the problems
Method 1)
login diskstation
Go to the Support Center > Support Services > click Generate log (remember to select Cloud Sync)
download file debug.dat
open in 7Zip go to CloudStation\var\log\ and open messages see if you can see any errors for cloudstation and adjust
Method 2)
SSH into your synology box navigate and open (used vi) var/log/messages - again look for errors
I noticed in mine the error
[ERROR] commit-file.cpp:232 link(, [ERROR] commit-file.cpp:232 link(, /volume1/@cloudstation/@sync/repo/.0): No such file or directory (2).0): No such file or directory (2)
sudo -s
navigated to /volume1/@cloudstation/@sync/repo/
ls -a showed that the directory .0 did not exist
mkdir .0
the sync now works

pwd
/volume1/@cloudstation/@sync/repo/.0
sh-4.3# ls -lah
total 0
drwxr-xr-x 1 root root 0 Feb 8 17:04 .
drwxr-xr-x 1 root root 130 Feb 8 17:04 ..
but no more errors
Hope this helps
Cheers
Rescue PC