Schematic diagram for the Xiaomi Mi 10S smartphone, packed as a RAR archive of around 1.16 MB. Phone schematics like this show the power management IC outputs, battery and charging path, display and camera connectors and RF sections, letting a technician trace a rail, identify a shorted capacitor or follow a signal between ICs. The contents are usually PDF pages opened in any PDF reader. Make sure the board version in the document matches the handset, since Xiaomi revises boards between regional variants.
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 @mischematic. 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.