Presents the user with an option to choose an image stored on their current platform, for example a photo on a phone or an image saved on a PC. This does not immediately capture the image.
Depending on the platform your app may continue running in the background whilst the user is choosing an image, or it may pause execution whilst the image is chosen. In any case you must assume your app continues running but is no longer visible.
There is another version of ChooseASync that fires an event instead when the user has finished choosing.
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