First part of a Note 8 Pro schematic set, a compact 360 KB PDF that likely holds only a few pages; the brand is not stated in the name, but Note 8 Pro typically refers to the Redmi model. Pair it with the companion file numbered (2) for fuller coverage. Short excerpts like this often show block diagrams, power trees or a single circuit area. Technicians use them to find the relevant rail or connector quickly before measuring. Check the mainboard identification against the document before trusting part values or test points.
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 @uzb4422. 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.