OPPO R7s repair archive in RAR format, 1.29 MB in size. The name gives no detail beyond the model, so open it with WinRAR or 7-Zip to see whether it holds schematics, a component layout or both. Material of this kind is useful for tracing battery and charging circuits, following power management outputs and locating test points when a handset is dead or will not charge. An identically sized copy also exists. Confirm the board revision on the PCB matches before relying on the references.
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.