Samsung SM-J260G repair archive, the Galaxy J2 Core variant, delivered as a 3.89 MB ZIP file. Its contents are not described in the name; Samsung service packs usually carry schematic pages and sometimes a component placement layout. These are used to trace PMIC rails, battery and charging paths, the LCD connector and key circuits, and to locate test points during no-power or short-circuit diagnosis. Open the archive to confirm what is included, and check that your board revision matches the one in the drawings.
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.