There's a technical reason you can't just make the SD card available as an USB bulk storage device, as convenient as that would be: It's already mounted inside Jolla, and if you'd export it as it is, you'd have two OS accessing the directory structures at the same time, which is a sure recipe for data loss. Details including a workaround (large file on SD which can then be exported as USB storage device) are in a Q&A somewhere on this site.
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