Lenovo boardview for LCFC board NM-E191 revision 1.0, packed in a 3.82 MB ZIP archive. LCFC, Lenovo's own ODM, labels boards with NM-xxxx numbers printed on the PCB, so confirm both number and revision. A boardview shows part outlines, pin nets and test points, so you can find a component quickly, follow a rail and check for a short with a multimeter. Extract it and open it in OpenBoardView, FlexBV or a similar boardview viewer.
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 @cynetitsolution. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.
Built-in OS tools7-Zip