Schematic archive for the Moto Z, model XT1650, shipped as a 66.6 MB RAR. The large size suggests a fairly complete set of service drawings, likely covering the main logic board, power distribution and the connectors used by the phone. A technician would use it to follow voltage rails when a handset fails to power on, identify which line a shorted capacitor sits on, and check signal routing to the display or charging circuit. Extract with 7-Zip or WinRAR, and compare the model code inside the phone with the documents before replacing parts.
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 @esquematicosdecelulares. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.