Cant get image filename or size in offline-app

Hi everyone, we are working on an app that can load pictures from the gallery. In this context, it is crucial for the app to know the filename for later use. As of now, we tried a) the Mendix-Camera-widget from the app-store and b) the in-built Image Uploader widget on an entity that implements System.Image (and thus also System.FileDocument). When using our app online, it loads the filename and -size perfectly. But when we test the app offline (after installation with an .apk-file), the name and size are not available. Has anyone got any ideas on why that might be and how to fix it?
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