How can I encrypt an external SD card on Fairphon 3 with /e/OS?

Formatting an SD card to work as internal storage leads to problems, so I am forced to format it as external storage. This seems not to be encrypted, although the data that probably needs most protection is usually stored on SD cards, like pictures and videos. How can I encrypt the SD card? I don’t need to use it from another device becuase I have automatic backup via SyncThing…

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You could use an encrypted container on the card, if these sources are to be believed (last one is for the Fairphone 2, but it proves somebody actually did this :slight_smile: ) …