Private Share Permissions for Files

When you share a file privately with a user, by default, the user has permission to view and download the file. You can add additional permissions for each user.

On the Share Link dialog box, in the Sharing Permissions section, you can check and uncheck permissions: 

The following table includes definitions of each permission.

ViewEvery user with access to a share has view access. You cannot remove view access directly. 
DownloadDownload permission allows a user to save the file.
UploadUpload permission enables a user to upload the shared file.
ShareShare permission allows a user to re-share files or folders with other users.
If you enable Share permission, Download and Upload permissions are automatically enabled.