ASUS boardview for the X551CA, revision 2.2, in the compact .fz format at 115 KB. The FZ format is common for ASUS boardviews and opens in programs such as FlexBV, OpenBoardView or Boardviewer, some of which need a decryption key. Technicians use it to find component locations, measure to ground at test points and follow nets between the PCH, power controllers and connectors. Check that the board on your bench is revision 2.2, since layouts can shift between revisions.
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 @schematiclaptopramkushwaha. Enginerys does not host this file.
How to open a .fz file
Compressed and encrypted boardview used for ASUS, ASRock and Pegatron boards.