Apple iPad Pro 12.9 repair material packed in a small RAR archive of 116 KB. The name gives no generation, board number or document type, so open it to see whether it holds a schematic extract, a boardview or reference notes. At this size it is more likely a compact boardview or a few diagram pages than a full schematic set. Before trusting it for tracing rails or locating test points, confirm that the generation and logic board revision of the tablet on your bench match what the files inside describe.
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 @schematicslaptop. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.