Hello,
Case 1: which is your influxDB configuration if you follow the guide you're set up to use the external. By the 2.2 version you would be oblied to use the external memory. You can both use the External memory as storage or as extension of the filesystem.
Case 2: you are right.
Case 3: you can use the memory as External Memory in any app and just signed apps can use the extension of the internal memory for safety reasons. The UI actually is not showing them 🙂 Generally Extended data can be used by your apps if are signed or if you have root but you would not be in production mode. If you mount the memory as removable meda you can write inside as long as you have the "removable-media" plug in the app.
Mauro
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