Samsung S5282 document in PDF, only 531 KB, with Comp in the name, which most likely indicates a component layout drawing rather than full circuit sheets, though that is not certain. No revision is stated. A component placement map lets a technician find parts and test points on the board by designator, useful when a schematic shows a faulty part but its physical location is unclear. It opens in any PDF viewer; check board markings on the phone match the drawing before replacing parts.
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.