I’ve recently had a problem covered here. Basically, the files put to Dropbox on my Mac wouldn’t appear in Linux. Without any warning from Dropbox. Without any visible reason. After many months of successful use of Dropbox on Mac, Windows and Linux. I was hopeless, but was helped by the Dropbox team. The thing was actually mentioned in FAQ, but under such a topic that I have never found it.
The solution was to turn on the extended attributes in Linux. For this, I’ve edited the
/etc/fstab file to add the
user_xattr attribute to the root partition options.
Of course, this was a Dropbox fault. If it cannot sync some files, it should issue a warning.