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Is it technically possible to edit a file directly and don't create a copy inside the application directory ?

I want to annotate an image or a PDF directly but every application saves a copy instead of modify my file.

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This is nothing to do with Android, but any way that's the norm in general. –  Narayanan Oct 17 '12 at 11:36
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closed as too localized by Chahk, roxan, Zuul, Al E., Matthew Read Oct 17 '12 at 16:44

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There is nothing which would prevent apps from modifying data files in-place. If they don't do so, then it's because the app developer decided so.

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