PDF of about 10.5 MB for the Microsoft Surface Laptop 4 Intel version, Wayland board design, marked SS. The SS suffix may indicate a reduced or simplified schematic set, but that is not confirmed, and the file is smaller than the full SCH document of the same project. Use it to follow power sequencing, charger and rail circuits and connector pinouts during board diagnosis. Check it against the boardview for exact designators, and confirm your unit is the Intel edition rather than the AMD one.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @cynetitsolution. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.