Hello Mario,
The function that you refer is part of the Cordova File app plugin (exactly is: "getFileBlobFromFileUrl", I am not sure there was renamed from: "getFileBlobFromFileUri")... so be sure that the Cordova File plugin is checked in the app's options -> Apache Cordova -> Plugins.
On the other hand, may you can consider to use a File input (set the "Accept" property to "image/*"). This works in all platforms and can be a very good idea in order to take a photo and upload it to the app's server. You can take a look at the "Http" sample app.
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