An archive of repair files. Shared as “A326K U3 Android 11 ROOT (A326KKSU3AUJ1) By_sandil2017.rar” — a .rar file, 17.3 MB.
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 @mrepairo. 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.
7-ZipWinRARThe Unarchiver (macOS)