Schematic PDF for the Samsung SM-G950F, the international Galaxy S8, sized 3.59 MB; the name also carries a website watermark tag. Circuit diagrams like this let a technician follow power rails from the battery connector and PMIC, trace signal lines and locate filters or capacitors when checking for a short to ground. Open it in a PDF viewer and search for net names. Make sure the board is the F variant, since US Snapdragon models of the S8 use a different layout.
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 @mobileshematic. 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.