Open Detached and save your model to Revit Server instead of copying .rvt files with Window's File Explorer.
When models are saved to Revit Server they are not single .rvt files but a compilation of optimized files for the Revit Server environement. When saved to Revit Server the single .rvt files becomes a .rvt folder with the optimed files and folders within that.
Implement Server-Based Worksharing from File-Based Worksharing