RAR archive of 1.27 MB for the Meizu MX4, named only after the device, so its exact contents are not stated. In repair libraries such packages typically carry schematics, block diagrams or layout pages that show where components sit and how power rails are distributed. Extract it with WinRAR or 7-Zip and check what format the documents use. When working on a no-power, charging or display fault, match the board revision printed on the PCB against the drawings before trusting component values or test point locations.
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.