Error in uploading the document from the network file share to Office 365 document library.

Yes. The console application is running on my user login and has full permission. Still I get the error in FileMode.Open 

using (FileStream o365FileStream = new FileStream(o365FilePath, FileMode.Open))
{
Microsoft.SharePoint.Client.File.SaveBinaryDirect(o365Context, o365ServerRelativeUrl, o365FileStream, true);
}