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As the name suggests, electronics folder contains schematics and pcb file, along with generated BOM and gerber files.
You can put something on the PCB to connect to these components. Vias, pads, a connector, something. That something should be present on your schematics, since you'll have to use some footprint object in the PCB editor, and the component used in the schematics editor should correspond to the footprint object in the PCB editor.
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