Schematic for the Samsung SM-G965F, labelled S9+ in the name, supplied as a 12.4 MB PDF. No board revision is given, so verify the version silkscreened on the PCB matches before relying on part locations. Repair work with this kind of document centres on tracing supply rails from the power management chips, checking the USB-C charging path, finding filters and capacitors on a shorted line, and reading connector pinouts for the display and sub boards. Any PDF reader opens it, and searching net labels speeds navigation.
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.