Zip archive of 882 KB for the Xiaomi CC9 smartphone. The name does not state whether it is a schematic, a layout or other service data, so unpack it and check the contents first. Repair material of this kind is used to trace the battery and charging circuit, follow PMIC outputs, and locate components and test points around the display and camera connectors. It speeds up diagnosis of shorts and no-power faults. Check that the board revision on the PCB agrees with the documents.
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 @esquematicosparatodos. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.