Full schematic set for the Apple iPhone 7, provided as a 2.58 MB PDF. The name gives no board number or revision, only that the document is complete rather than partial. It serves for tracing power rails, following signals between the logic board sections, checking connector pinouts and identifying components on a shorted line, which is common work on this model. Open it in any PDF reader, and confirm the logic board variant matches, as iPhone 7 boards were built in different modem configurations.
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.