Samsung SM-A730F repair package in a 6.00 MB ZIP archive. The file name states the model code but not the contents, so extract it and see whether it holds a schematic, a boardview, a service manual or firmware before relying on it. The F suffix marks a specific regional variant, and other suffixes can use different boards, so check the code on your phone. Documents of this kind help a technician trace power and charging paths, locate components and test pads and diagnose faults such as no power or no display.
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 @tamirat_moobile. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.