Archive for the OPPO A83 smartphone, 1.37 MB in rar format, with an uninformative name that does not say what is inside. Files of this size for a phone are commonly schematics or board layout data, so open it and check the formats first. Diagrams let a technician follow power rails from the PMIC and trace charging, USB and display lines, while layout files help pinpoint component locations. Verify the board version against your unit, as the name lists no revision.
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.