Schematic package in zip format, 2.22 MB, with a name that suggests the Samsung Galaxy J4 (SM-J410F/G), although the brand is not stated in the file details. Phone schematics like this show the PMIC, charging, display, and RF sections with component designators. They help a technician find power lines, check for shorts and choose test points during board-level repair. Extract the archive and confirm that the model code printed on the board matches before relying on any values.
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 @phoneSchematics. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.
Built-in OS tools7-Zip