Apple iPhone 6S Plus repair material in a ZIP archive of 13.1 MB; the file name gives only the model, not the content or board number. Expect schematic pages, boardview data or component maps, and check the archive to confirm. These files are used to locate parts, trace signals between chips and connectors, and check rail voltages and diode-mode values while diagnosing boot or charging faults. The 6S Plus uses a different board from the regular 6S, so confirm the device size and board markings before applying them.
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 @esquematicosparatodos. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.