Samsung service schematic labelled SM-E700H, the model code used for the Galaxy E7 phone. At 12.8 MB the PDF is likely a full diagram set covering power management, charging, baseband, display and peripheral circuits. Phone technicians use such documents to trace supply lines from the PMIC, find test points and connectors, and follow the path of a faulty signal when diagnosing no-power, charging or display problems. Check that the variant code and board revision on the PCB match before relying on component locations or 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 @Schematic_mobile_iran. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.