Image (file) handling in native apps

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Hi All, I am working on a Native app where I need to Post an image(file) to a Rest API. The API can receive either url, a file or a base64 encoded image. In a microflow it is ‘easy’ to encode a file to base64, but in a nanoflow (which is my only option since its a native app) I can't seem to figure out how to retrieve the image file or to encode it to base64.  I've written the api call in a javascript action, but I can't find a way to send the image file along. Can anyone help me out here?
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1 answers
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It's not your only option. From a native app you can call a microflow, which can handle the rest transaction from the runtime.

[EDIT] This is just to illustrate how you could handle this in one transaction:

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