A first server computing device, including a processor configured to receive, from a first application instance, a first access request for a file. The first access request may include a first modification privilege request and a modification privilege sharing request. The processor may determine that the file is not locked for editing and grant the first application instance access to the file with modification privileges indicated by the first modification privilege request and without modification privilege sharing permissions indicated by the modification privilege sharing request. The processor may set the file to be locked for editing. The processor may receive, from a second application instance, a second access request including a second modification privilege request. The processor may determine that the file is locked for editing and deny the second application instance access to the file.