Schematic for the Samsung Galaxy A21s, model A217F, provided as a 6.22 MB PDF. The F suffix marks the global variant. Technicians use a document like this for board-level work such as following the power tree from the battery connector to the PMIC, tracing charging IC and USB lines, checking display and backlight circuits and locating test points while chasing a short. It opens in any PDF reader, and searching net names speeds tracing. Verify the board model printed on the PCB matches the A217F before relying on component 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 @uzb4422. 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.