Auto Rename app provides assistance finding files that contain invalid character(s) in their file name. In addition, app helps you to replace found invalid character(s) in filename to allow syncing to OneDrive or SharePoint.
OneDrive uses some characters that have special meanings when used in file names. For example, if a file or folder you are trying to upload to OneDrive contains any invalid character(s), it fails to syncing. You will need to rename the file or folder to remove these characters before you upload it.
More information about restrictions and limitation in OneDrive and SharePoint can be found at https://csymas.com/AutoRename