How to resolve a file sync warning on a Windows or Mac machine:

1. When an issue occurs, you will see a Resolve Sync Warning icon over the following (your icon may look like a rocket):
   

   System tray icon:

   System tray menu:

   Affected file:

2. Click the icon on your computer’s system tray or menu bar, and select the Sync Warnings icon.Note: On a Windows machine, the icon is located in the lower right-hand corner of the screen; on a Mac machine, the icon is located in the upper right-hand corner of the screen.The Preferences dialog box displays, showing the Warnings tab.
3. Click the Resolve link to learn more about the warning, and what you can do to resolve the issue. For example, for file collisions:
   1. Click the Rename button to rename your copy to include the term collision appended to the end. When this option is selected, you will see two files: the original_file_name file and the original_file_name (collision) file.
   2. Click the Discard button to discard your copy without saving changes.
   3. If the “Allow Users to Overwrite Collisions” policy has been configured, you can also click the Overwrite Current button to sync your local copy as the current server version.

Types of File Sync Warnings and Resolution Options

File Collision

This file isn’t syncing because the local changes are conflicting with the cloud version. To resolve this issue, you can select from: Rename – Rename the local file so the new changes sync to the cloud. This creates a new file. Discard – Discard the new changes and sync down the cloud version. This option will send your recent local changes to the Recycle Bin. Overview – Overwrite the cloud version with the new changes. Note: This option will only be visible if it the Allow users to overwrite collisions policy is enabled.

Folder Exists Upstream (Folder collision)

This folder isn’t syncing because a folder with the same name already exists in the cloud. To resolve this issue, you can select from: Rename – Rename the local folder to begin syncing to the cloud. This creates a new folder. Delete – Delete this folder and sync down the cloud version. After choosing Delete, users are prompted to confirm. Clicking the OK button will send your local folder to the Recycle Bin.

Invalid Credentials for Synced Network Path

There is a problem connecting to this folder. You can try updating your credentials to regain access. After clicking Enter Credentials, the user will be prompted to log in.

File Is Locked

The new changes won’t sync because the file has been locked. This error will resolve itself when the file is unlocked.

Sync Root Folder Missing

This folder isn’t syncing because it could not be found. This could happen due to one of two situations: Folder was actually deleted or never created. Not able to access the drive itself (for example, the folder is located on a flash drive or network share). To resolve this error, you can select from: Unsubscribe – this option will unsubscribe the user from the Team Share. Re-Sync – this option will re-sync this data from the cloud.

Folder Permission

You don’t have the right permissions to sync this folder. To resolve this warning, you can select from: Dismiss – this option will hide the warning; the folder will not sync.

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Source: Resolving a File Sync Warning