Samsung schematic package labelled F946U, supplied as a 2.06 MB ZIP archive. The name gives only the model code, which matches the US variant naming Samsung uses for its Galaxy Z Fold series, so confirm the exact model and board revision before use. Phone schematics like this help a technician trace power rails from the PMIC, follow charging and display lines, and locate test points while diagnosing shorts or no-power faults. Extract the archive and open the contained PDF or image pages in a standard viewer, checking that the PCB markings match your unit.
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.