Zip archive labelled Xiaomi Mia3, most likely relating to the Xiaomi Mi A3 smartphone, though the name does not say whether it holds a schematic, boardview or firmware. Open the archive and check what it contains before use. Phone schematics and layouts help trace charging and power rails, locate components and test points, and find shorts on a densely packed board. Confirm that the board markings and model of your phone match the files before relying on any component location.
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 @Schematic_mobile_iran. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.