Small PDF schematic of 116 KB named Sensor, with no device, brand or board number given. It is probably a single page or partial sheet covering a sensor circuit, such as a hall, light or thermal sensor section taken from a larger diagram. A technician can use it to follow supply voltages, pull-ups and signal lines to the controller when checking a failed sensor. Because the source device is unknown, compare its connector pinouts and part references with the actual board before relying on it.
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 @vinafix_bios. 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.