There some miss understood between you and me
QlikServer Name: QSServer Qlik Service User: QlikSense
outside Server Name: FileServer. IP: x.x.x.x
Outside Folder Name: ShareFolder
Could you access to \\FileServer\ShareFolder from QSServer from RUN dialog using user QlikSense?
if NO please share access permission to \\FileServer\ShareFolder for QlikSense user