Compressed RAR package for the OPPO A59S phone, 11.0 MB. Beyond the model name nothing in the title describes the contents, so treat it as an unlabelled repair bundle that may contain a schematic, PCB layout or service material. Extract it with 7-Zip or WinRAR and review the files first. Such documents help a technician trace charging and power rails, find test points around the PMIC and check suspected shorts, but always compare the board marking on the device with the document before trusting component 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.