Sony schematic in PDF form whose short name only says z3, most likely a Sony Xperia Z3 phone, although the name states no full model code or board revision. At 15.7 MB it probably contains multiple circuit pages. Use it to trace power management, charging and display circuits and to locate test points, but first compare part numbers and connector layouts against the actual board, because the Z3 family includes compact and dual-SIM variants. Any PDF reader opens it.
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 @Schematics_Mobile. 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.