One of the best parts in Magento is its admin interface. There is support for all kinds of input types (text fields, radio buttons, dropdowns, multiple selects, etc.), that can be stored in various ways (plain, encrypted, serialized), and displayed in numerous ways (grids, forms, simple fields, images).
What makes Magento great is the possibility to extend this default interface (especially store configuration part), and add our own fields easily. Let’s extend it with a custom file upload field.
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