ZIP archive of 2.54 MB labelled for the Apple iPhone 7, written as 7G in the name. No board revision or content list is given, so inspect the archive to find out whether it holds schematics, boardview data or reference pictures. Material of this kind supports logic-board work: tracing rails from the PMIC, locating filter components, checking resistance to ground and planning micro-soldering. Different iPhone 7 variants may use different board versions, so match the board markings to the documents before relying on any values.
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.