Archive for the Samsung Galaxy A80, model SM-A805F, 11.5 MB in RAR format. The file name does not specify the contents; at this size it is more likely service documentation such as schematics or board layouts than a complete firmware package, so extract and check. Documents of this kind help locate PMIC, charging and display circuits and test points during board-level phone repair. Check that the model code on your device matches SM-A805F exactly, since other variants of the A80 may use different hardware.
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 @esquemaseletricos. 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.