Schematic PDF for board NH50HHHJHK, dated 2021-06-07 by the name. SM likely means service manual or schematic material, so check the contents. NH50-style names match Clevo platform models that are sold under many brands. The 7.74 MB document is for tracing power sequencing, voltage rails and signal paths, and for finding part values during board-level repair. Open it in any PDF reader. Confirm the model name and the revision printed on the PCB, because Clevo builds several variants on similar platform names.
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 @fixtronix. 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.