PDF of 458 KB for the LTA216AT01, a code that reads as an LCD panel model; at this size it is probably a specification sheet rather than a full schematic. Such documents usually cover connector pinout, interface signalling, supply voltage and current, timing and backlight ratings. Use it to verify panel compatibility, confirm voltages at the panel connector and identify pins when testing. Make sure the label on your panel shows the same model and suffix 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 @datasheets1. 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.