RAR archive of 1.32 MB tagged for the Xiaomi Mi4 phone, with no indication in the name of whether it contains schematics, a layout or other service data. Unpack it and check the contents before planning a repair around it. Documentation of this size for a handset is usually a circuit diagram used to follow power distribution from the PMIC, check charging and USB paths and identify connector pinouts. Always match the PCB markings on the device against the drawings, since phone boards often have several revisions.
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 @SMART_PHONE_SCHEMATICS. 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.