RAR archive of 1.52 MB identified only as OPPO A37, with no indication in the name of whether it contains schematics, boardview layouts or firmware. Unpack it and review the files before depending on them. When the contents are diagrams, they are useful for tracing supply rails from the PMIC, checking charging and display circuits, and locating test points. If it is a firmware component, keep a backup of the original data and confirm the A37 sub-variant matches, since this model was produced in different regional versions.
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.