A schematic diagram for Samsung hardware. Shared as “SM-A045F_Schematics.rar” — a .rar file, 4.26 MB.
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.