PCB layout document for the Apple iPhone 8 Plus, a 972 KB PDF according to the name. Layout files of this kind show component placement on the logic board, letting a technician locate parts, test points and connectors named in the schematic. No board revision is stated, so confirm it against the physical board. Use it alongside the matching schematic when hunting a short, replacing a capacitor or checking which side a chip sits on. It opens in any PDF reader, and zooming in reveals the reference designators.
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 @schematic_mobiles. 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.