If you see empty system folder chooser dialog, like below:

You need to go to the menu and tell the system to show the SD card or Internal storage (below you can see case of SD card selected)

Tap on the SD card from the list on the left side to display its folder structure. In this screenshot you see both “Internal storage” and the SD card. The SD card can be displayed under a different name then what you see here, for example “Kingston”. It’s the so called “disk label” of the card. The disk label is a short text the user uses to name the card. If there is no disk label, the system folder chooser uses a generic name “SD card”.

Then select the card or navigate down into any subfolder (below you can see root of SD card selected)

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