Compressed RAR archive, 5.12 MB, for the OPPO R11s smartphone. The name gives no more than the model, so contents such as schematics or a board layout have to be checked after extraction. Material of this type lets a technician trace PMIC rails, follow USB and charging paths, locate test points and pin down shorted capacitors near the processor. Before using any reference, compare the PCB markings with the documents, and do not mix it up with the regular R11, which uses a different board.
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.