Xiaomi Mi Play schematic in a 1.71 MB zip archive. Only the model is given in the name; no board number or revision is listed, so check the title block on the drawings once extracted. A phone schematic like this is used to follow power rails from the battery connector through the PMIC, trace the charging and USB-C paths, and find components feeding the display, cameras and SIM circuits. Before measuring, make sure the board you have is the same version as the documentation, since component placement can vary.
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.