RAR archive labelled for the Meizu U20 smartphone, about 2.3 MB; the name does not state what it contains, so it may hold schematics, board layouts or service notes. Repair material for phones of this kind is used to find PMIC outputs, charging paths and connector pinouts when diagnosing boot, charge or display problems. Open the archive and check file types before relying on it, and compare any board marking inside with the one on your phone's PCB, since variants can use different layouts.
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 @SMART_PHONE_SCHEMATICS. 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.