Dropbox not working in MacOS High Sierra

Is there a "High Sierra" OS?  My iMac is running macOS Sierra Version 10.12.6 and the Dropbox app is working fine here, but won't install on my MacBook, so no folders downloaded.  It's just me and my two computers so, no IT department to call.  This is the message I just sent to Support:  

I am reluctant to change system commands just for this one app.  Why name a file starting with a period when you know Apple is going to have a problem with it?  I just tried searching for any other folders on my hard drive on the iMac desktop (purchased 08/17) that might start that way and here is the message that I got:  <<Names that begin with a dot “.” are reserved for the system.  If you decide to go ahead and use a name which begins with a dot the file will be hidden.>>

It looks like you may have some files in your folder that have their permissions incorrectly set. You can fix that with the following steps: 1) Stop the Dropbox desktop application (if needed) Click on the Dropbox icon. Choose Quit/Stop/Exit 2) Open your Terminal app (Located at /Applications/Utilities/Terminal) 3) Copy and paste the following lines into the Terminal, one at a time, and press RETURN after each one. PLEASE make sure you copy and paste these commands (don't type them by hand), as getting them wrong could cause some harm. You'll be prompted for your computer user's password (not your Dropbox password) after entering the first command. Keep in mind that the password field in the terminal will remain blank as you type your password. After you type it, just press ENTER. You'll know that these instructions complete normally once the initial line of text (called prompt) comes up again: sudo chflags -R nouchg ~/Dropbox ~/.dropbox sudo chown "$USER" "$HOME" sudo chown -R "$USER" ~/Dropbox ~/.dropbox sudo chmod -RN ~/.dropbox ~/Dropbox chmod -R u+rw ~/Dropbox ~/.dropbox Please note that once the prompt displays, the instruction completed the requested task, and is ready for the next command. If the command returns an error, or does not respond after an hour, you may want to try restarting your computer and try these steps again. If you have any questions before you do this, or if you see an error after running one of these commands, please let us know! 4) Restart Dropbox from Applications Another possible cause of these issues would be local network sharing or folder redirection preferences setup in folders or files within your Dropbox. Similar effects can also happen when your Dropbox folder or its system files are located in a mounted network drive or a remote location (like roaming profiles) since this could cause Dropbox to not have constant access or permissions to operate in those locations. This is especially an issue if other people in the network could be accessing the same data. For these reasons, I'd suggest that you ensure that your setup does not include any of the above scenarios. You may need to reach out to IT if your computer is in a corporate environment to check any of them.

Dear all,

Thank you so much for advice from all of you.  I have tried to type in commands in terminal and finally fixed the issue.  Really appreciate all your efforts to let me have the solution.  Now I can put my dropbox as one of the folders in sidebar and sync automatically.  

Again, thanks for your help.

Best regards,

Andy

Hi there, 

I have the problem that my dropbox is still downloading all documents, but doesn't upload any. We use dropbox for business in our company and actually I'm the only one, who has this problem (iMac 27" late 2012, High Sierra 10.13.3). On my MacBook (Sierra, not High Sierra) it works fine. 

I tried everything, which was mentioned in this thread, but I got an error with your solution. I have two Dropbox Accounts (private and business) on the mac, there are name "Dropbox (Private)" and "Dropbox (SSE)". When I use the commands you wrote, I get errors "no file in that directory". When I change the path as mentioned in the screenshot attached (in German), I get an syntax error in the terminal: bash: syntax error near unexpected token `('

I would be very glad, if there is a solution for this. At the moment I have 300 files, which are in the queue for uploading and this is very disturbing for our business and especially for me. Thanks a lot in advance!