Second ZIP archive in a K30 PRO set, 1.47 MB, with the name giving no document type, board number or revision. It probably accompanies the first file of the same name, and the model label suggests the Redmi K30 Pro, but the actual contents need to be checked after extraction. If it holds schematics or layout pages, they can help trace power rails, locate connectors and test points, and track down shorts. Open the extracted files in the appropriate viewer and confirm that markings on the phone board match before relying on them.
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.