Rar archive of 5.12 MB named simply OPPO R11S, giving no details of its contents. Repair packages for this phone typically hold schematics or board layout files, so unpack it and identify the formats inside. Schematic PDFs show power rails and signal paths, and boardview-type files open in a dedicated viewer to find components and test points quickly. Because no revision or variant appears in the name, compare the documents with the PCB markings on your unit before trusting component values.
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.