RAR archive of 6.12 MB labelled for the Xiaomi POCO X3 Pro. The name does not reveal what is inside, so it may hold a schematic, boardview or service material; extract it and check the contents before relying on it. No board number or revision is stated. Repair documentation of this kind is used to trace power lines from the PMIC, locate components and test points and diagnose charging, display or no-power faults. Make sure any diagrams match the board version of your phone, as Xiaomi sometimes revises hardware within one model.
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 @GENERAL_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.