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Not parent, but I'm looking into Syncthing (https://github.com/syncthing/syncthing & https://syncthing.net) and they document the issue and known workarounds to sharing from external SD-cards on Android: https://github.com/syncthing/syncthing-android/wiki/Frequent...

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syncthing is a great choice, I've been happily using it for 2 or 3 years across Linux, Android, and Windows. I've never had to do anything special to use an SD card on Android.

> I've never had to do anything special to use an SD card on Android.

It appears newer versions of Android do not provide a way for apps to access _external_ storage using ordinary POSIX APIs. SD cards can be used to back and provide "internal storage" on Android, and I don't think that is a problem (yet).

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