Second copy of the Huawei S7 schematics, a 1.80 MB PDF whose name differs only by a numbered suffix. It is most likely identical to the other S7 schematic file of the same size. The drawings serve the usual repair tasks: following voltage rails, locating components by designator, and checking connections between the main chip, power management and connectors. Any PDF viewer will open it. Compare the board revision printed on the device with the document before trusting specific part values.
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 @schematic_mobiles. 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.