After Apple rolled out its macOS Sierra update yesterday, some users have been experiencing issues with Dropbox s cloud storage service on it, such as error messages when moving files into the synced folder and confusing sync icons.
According to Dropbox, these problems might be caused by iCloud.
It suggested a few steps that you can take to ensure that the app works smoothly:
Install the latest version of Dropbox v10.4.26 .
Keep or move back your Dropbox folder in the default location; here s how.
When you move files from an iCloud-synced folder into Dropbox, you ll get a notification letting you know that the files are being removed from iCloud.