It will depend on how you want to access it later. There are two options for what you are considering: since the image is already saved on your phone, there is no need to save it twice as a drop. Or, if you move the image to your phone or delete it, it will be better. In fact, it would be better for you to save the image in a directory reserved only for images from your application, and then read all the file names in this directory later for access.
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