RAR archive of 8.73 MB named only M127F, which follows Samsung model coding and points to the Galaxy M12 (SM-M127F). No other details are given, so the archive may contain schematics, layout drawings, a dump or repair notes, and it should be opened to check what it really holds. Packages of this size usually carry service documents a technician uses to follow power lines, find test points and locate parts. Verify the model and board revision on the device before applying anything from it.
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 @uzb4422. 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.