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Core Data is an object persistence framework for iOS that essentially wraps around SQL. It looks like it’s losing data when the external storage option is enabled.

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What does external storage refer to here? I don't think iOS has extendable storage does it? So is it eg. iCloud?

It appears to be "external" to the sqllite database

https://forums.raywenderlich.com/t/where-is-allows-external-...

If you have a large amount of data to store, instead of embedding it in-line inside the database itself you’d store it in a separate file.

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