Samsung Galaxy A02s (SM-A02S) schematic section in PDF for the microSD card slot, 3.70 MB. Expect the card socket pinout, data, clock and command lines, card detect and the supply rail feeding the memory card. Technicians use it when a phone does not recognise SD cards or shows corruption, measuring the supply and checking lines back to the processor. It belongs to a set of sectioned A02s pages, so cross-reference with the SIM page if the tray shares a connector, and match your variant.
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 .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.