First part of a ZIP archive labelled K30 PRO, 374 KB in size, with no brand field or document type stated in the name. The title most likely refers to the Redmi K30 Pro, but whether the contents are a schematic, layout or other service data cannot be told from the name alone. Its small size suggests documents such as PDF pages rather than a full firmware package. Extract it and inspect the files, and look for the companion second part, before using anything on a board; verify the board markings match.
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 @esquematicosparatodos. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.