Does Tealium SDK access the application internal storage e.g. for iOS

Could you please highlight complete detail about application security using Tealium SDK. Will it access the application internal storage in default integration.
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No, none of the Tealium native mobile libraries read any files it does not create on application storage. Tealium only gather's runtime contextual device information, and information provided by the client application. There's is a toggle-able feature called iVar Tracking (instance-variable tracking) that will gather additional property data to objects passed in Tealium's track call. So a compact library implementation that passes no sensitive objects in Tealium's track call will preempt tracking of any sensitive data.
Tealium Employee