Archive for the Meizu U20 smartphone, about 2.26 MB in RAR format, with no further detail in the name about its contents. Files of this size in repair collections usually contain schematics or component layout drawings, though the exact type should be confirmed once extracted with WinRAR or 7-Zip. Such material helps a technician follow power and charging lines, find the PMIC and connectors, and locate parts around a short circuit. Verify that the board markings on your unit correspond to the documents before measuring.
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 @cyberlanelectonik. 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.