Samsung SM-F700U archive, a 5.38 MB ZIP whose name gives only the model code. The contents are not described, so extract it to find out whether it holds schematics, layouts or a service manual. For a folding phone, such documents are especially useful for tracing flex and hinge connections, display power and charging circuitry, as well as locating test points on the main board. Check that the device's model code matches exactly, as regional variants may differ.
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 @esquematicosparatodos. 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