Dropbox may not be able to update your Selective Sync preferences if any of the following are occuring:
- Your hard drive is low on space
- Files or folders are in use
- Incorrect file permissions
- You’re using symlinks or referenced files
It's possible that there's no room to save the data that's necessary to update your Selective Sync preferences.
To see if this is the case, check your available hard drive space. If you hard drive is very low on disk space and you're unable to free up space using Selective Sync, you'll need to make space available outside of the Dropbox folder.
Dropbox is not able to selectively sync folders if they (or the files they contain) are being used in other applications.
To resolve this issue, close any applications that are accessing files in your Dropbox folder before attempting to update your Selective Sync preferences.
If files in your Dropbox don't have correct permissions, Dropbox may not sync them. Use the menu below to troubleshoot file permissions on your specific computer operating system.