Layout document in PDF form for the Motorola Moto G4 Plus, model XT1640, marked as layout part 1. At 104 KB it is a compact drawing, most likely showing component placement on the phone mainboard rather than full circuit pages. Technicians use such layouts to find where a capacitor, connector or IC sits when tracing a fault found on the schematic. Any PDF reader opens it; zoom in on designators and compare the drawing with your board, since phone boards can differ between regional variants and hardware revisions.
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.