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Actually iOS allows background sync I believe

Mobius sync uses it on iOS I think!

As per the mobius sync FAQ:

"No iOS app can run continuously in the background. This means that Möbius Sync can only connect to other devices whilst the app is open, for a short time thereafter, and whenever it is triggered to run briefly in the background."

Yup that last part is the entitlement !

It's such a brief amount of time, it's impractical for it to do something useful during that time, like sync a file.

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