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There are SD cards with WiFi support
(upload.wikimedia.org)
This is for strictly mildly interesting material. If it's too interesting, it doesn't belong. If it's not interesting, it doesn't belong.
This is obviously an objective criteria, so the mods are always right. Or maybe mildly right? Ahh.. what do we know?
Just post some stuff and don't spam.
Acts as access point, if you connect to it from another device you get access to stuff on the SD card (via app or built-in webserver)... at least in theory. Quality varies.