By Ivy / Last update April 1, 2022

User Case

Smart Sync Not Showing Up

After upgrading to Dropbox Plus, with 2TB of space, I just transferred a lot of files and folders into my Dropbox. I thought they would automatically be online-only, but when they started to sync they have almost totally filled my hard drive. I cannot change anything to "online-only." That option is not available to me. I have tried it after Pausing Sync and that did not change anything. And only have selective sync available under preferences, please help, thanks in advance.

Sometimes, you may encounter the Dropbox Smart Sync not working issues like the user, what should we do to fix it? Don’t worry, we will explain for you.

About Drobox Smart Sync

Dropbox Smart Sync is a Dropbox advanced feature that helps you view, access the all files and folders in the Dropbox desktop folder from your computer and using virtually no hard drive space. It is available in Dropbox Plus, Professional, Standard, and Advanced for individuals and business teams. 

You may meet the following Dropbox Smart Sync not working problems while using Dropbox, find solutions here respectively

Dropbox Smart Sync not showing up

If you connected a personal Dropbox account, Smart Sync won't be available for that personal account. Or the Smart Sync isn’t here in your Dropbox Plus, or others.

Solution: update the desktop app and Mac app to the same as well if you just upgrade Dropbox account to Dropbox Plus, or other editions in

Dropbox Smart Sync online only not working

Sometimes, you may find the Smart Sync online only not working, because the smart sync files downloaded unintended.

Solution: Make the files online-only again. Right click the file, and select Smart Sync > Online Only.

Smart Sync Online Only

Dropbox Smart Sync not freeing up space

If your Dropbox is full or show low disk space due to the Dropbox documents. You have to free up space.

Solutions: The two ways: Selective Sync and Delete files, could help you to free up space. Here we are going to show you about the selective sync to free up space for you hard disk.

1. Click Dropbox icon on the Windows tray, click your account profile icon, and select Preferences.


2. At the Sync tab, press Selective Sync and then Uncheck the folders and files that you would like to remove from your computer but still on your Press Update to confirm. 

Selective Sync Remove Files

Dropbox Smart Sync unspecified error

The Dropbox Smart Sync issues usually occurred while opening Microsoft Office files, words, excels, and PowerPoint.

Solution: Set the Smart Sync to Local. Here are the steps: Right click the file or folders, select Smart Sync, and then choose Local, open the files or folders when it’s downloaded.

Smart Sync Local

Smart Sync is experiencing an issue 

And there are some reasons should be responsible for this issue: Some updates happened to the Dropbox; Lack of Windows security updates; Antivirus or Security software maybe blocked the Dropbox; Something required for Smart Sync is not installed or running properly; Software conflicts.


1. Add Dropbox to White-list in Antivirus or Security Software.

2. Install Windows latest updates.

3. Restart the computer and Dropbox desktop app.

4. Reinstall Dropbox with Admin privileges.

5. Disable all running software to fix the conflict (like HIBUN software, etc.).

Dropbox Not Syncing

Besides, another issue like Dropbox not syncing maybe disturb you while syncing data to Dropbox. First ensure your computer, phone, tablet is connected to Internet, signed in the same Dropbox account, and the files or folders are located in Dropbox folder. If all is right, please refer the following solutions:

1. Rename File name without these characters: / \ < > : “ | ? * . and shorter than 255 characters.

2. Do not sync some system files and temporary files like desktop.ini, thumbs.db, *.tmp, ~file, etc.

3. Change the file location to make the file components less than 300 components.

Dropbox Free Alternative - AOMEI Backupper Standard

If you have problems with sync files to Dropbox with Dropbox application, you may want to try professional file synchronization software - AOMEI Backupper Standard, which is designed for Windows computers to sync files to cloud (like Dropbox, Google Drive, OneDrive, Box, etc.) with simple clicks.

It’s highly recommended by million of users over the world due to its reliable synchronization, intuitive interface and outstanding performance. And now please download AOMEI Backupper Standard to have a try. 

Download Freeware Win 10/8.1/8/7/XP
Secure Download

You could enjoy the following sync features:

1. Schedule sync. It allows you sync files to Dropbox or other clouds via daily, weekly, monthly, USB plug in, etc.

Schedule Settings General

2. Sync Settings enables you to comment the sync task to differ from others, enable email notification to get the SMS or email alert after the sync finished, run specified program before the sync, etc.

Sync Settings

3. One-way sync function can greatly protect the data on the source path.

4. Multiple Sync destination selection: apart from clouds, you could also sync files to external hard drive, USB drive, SD card, network share or NAS, local disk, etc.

5. Event Triggers Sync: you could trigger the sync task by the four events: user logon, user logoff, system startup, system shutdown. And you could sync files to Dropbox without occupy your working time.

6. Real time sync: It allows you to real-time monitor the source directory needing sync. If there is any change happens to any file or folder in the source directory, the program will sync them to the Dropbox immediately.

The last two are premium features, please upgrade to AOMEI Backupper Professional or other advanced editions to enjoy.


If you meet the Dropbox Smart Sync not working problem or Dropbox not syncing files, you could try the best Dropbox alternative - AOMEI Backupper Standard to sync files to Drobox easily to safeguard all your files and folders. You can even sync open files without efforts.

Besides, AOMEI Backupper is also backup and restore software, which allows you to backup data to an image file to anywhere else you specified, create system backup for Windows PCs to prevent system boot failure, backup entire hard disk to other place just in case you need to restore everything, etc.