Small RAR archive, just 372 KB, labelled for the Xiaomi Poco X2. The name reveals nothing beyond the model, and at that size it most likely holds a few diagram or layout pages rather than a full service manual. Open it with WinRAR or 7-Zip to see what is included. Repair documents of this sort help locate components, follow power rails from the PMIC and check suspected shorts. Confirm the drawings match the board revision in front of you before trusting the reference designators they show.
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 @cyberlanelectonik. 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.