File Upload via fetch

How can I make file Upload work with react-native-document-picker:

DocumentPicker.show({
      filetype: [DocumentPickerUtil.allFiles()],
    }, (error, res) => {
     const { uri, type: mimeType, fileName } = res;

      const formData = new FormData();
      formData.append('file', { uri, type: mimeType, name: fileName });

      const config = {
            method: 'POST',
            headers: {Accept: 'application/json'},
            body: formData,
      };
      console.log(config);
      return fetch("/endpoint", config).then((response) => { console.log(response); response.json(); });

});

But get back that file is missing in upload on the server

[ionbaratol]

This works only for iOS, for Android you get a uri form the ContentProvider of type content:// which FormData can’t read

[zsubzwary]

@schmaluk you have no IDEA, you basically saved my life !!