Apple iPhone 6 Plus schematic or repair document in PDF format, 1.49 MB. The name does not give a board number or a page count, so open it to see whether it holds full logic board schematics or a partial diagram. Such documents help trace power rails from the PMIC, locate filters and connectors and diagnose charging, backlight or baseband faults. Any PDF viewer opens it, and pairing it with a boardview file speeds up component location. Confirm the board revision on the phone matches the drawings.
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 @esquemaseletricos. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.