Rar archive named after the OPPO A71, 1.52 MB, without any indication of the document type inside. Expect repair material such as schematics or a board layout, and extract it to confirm. These references help trace the power-up path, check which components hang on a shorted rail and follow signals to the charging port, display or camera connectors. Since no revision or variant appears in the name, compare part references and layout with the physical board before trusting values or test point positions.
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.