Samsung SM-G850F schematic, a fairly large 14.6 MB PDF that likely includes detailed multi-page circuit sheets. The name gives only the model code with no board revision. Technicians use it to trace power rails from the PMIC, check the charging and USB path, follow display, camera and sensor connector signals, and locate components when isolating a short. Any PDF reader opens it. Check that the model code on the phone matches before relying on values, as regional variants may differ in radio and power sections.
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.