RAR archive of 2.26 MB for the Samsung SM-J250F, sold as the Galaxy J2 Pro. The name does not reveal what is inside, though packages this size usually contain schematics or troubleshooting PDFs. Extract it with WinRAR or 7-Zip and check every file. Repair references for this model help trace charging and power lines, identify components by designator and locate test points when diagnosing a dead or shorted board. Confirm the model code on the device label is J250F before relying on the layouts.
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.