Circuit diagram titled UX50, delivered as a 1.45 MB PDF. The name gives no brand, revision or full board number, so read the cover page to confirm which board it covers. The schematic supports board-level work such as tracing voltage rails from the charger onward, checking signals, locating test points and identifying the component on a shorted line. Any PDF reader opens it. Verify that the code printed on the motherboard matches the drawing before taking measurements from it.
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 @schematicslaptop. 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.