Layer image archive labelled A107F, a 26.8 MB zip that appears to hold pictures of the individual copper layers of a phone mainboard for that model code. Such material helps a technician see where a track runs between pads, especially beneath shields and BGA packages, when restoring broken lines or tracing a corroded section after liquid damage. Use it together with a schematic for the same code, and verify that the board revision matches before assuming identical routing.
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 @phoneSchematics. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.
Built-in OS tools7-Zip