fix fetching protocol from server on Android

config.xml

@@ -1,5 +1,8 @@
 <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
-<widget android-versionCode="6413" id="org.codaco.NetworkCanvasInterviewer6" ios-CFBundleIdentifier="org.codaco.networkCanvasInterviewerBusiness" ios-CFBundleVersion="6413" version="6.5.2" xmlns="http://www.w3.org/ns/widgets" xmlns:android="http://schemas.android.com/apk/res/android" xmlns:cdv="http://cordova.apache.org/ns/1.0">
+<widget android-versionCode="6415" id="org.codaco.NetworkCanvasInterviewer6" ios-CFBundleIdentifier="org.codaco.networkCanvasInterviewerBusiness" ios-CFBundleVersion="6415" version="6.5.2"
+  xmlns="http://www.w3.org/ns/widgets"
+  xmlns:android="http://schemas.android.com/apk/res/android"
+  xmlns:cdv="http://cordova.apache.org/ns/1.0">
   <name>Network Canvas Interviewer</name>
   <description>
         A tool for conducting Network Canvas Interviews.
@@ -38,8 +41,6 @@
     </edit-config>
   </platform>
   <platform name="ios">
-    <allow-navigation href="*"/>
-    <allow-navigation href="*"/>
     <allow-navigation href="*"/>
     <preference name="WKWebViewOnly" value="true"/>
     <preference name="Allow3DTouchLinkPreview" value="false"/>
@@ -84,4 +85,4 @@
   <plugin name="cordova-plugin-network-information" spec="~2.0.2"/>
   <plugin name="cordova-plugin-chooser" spec="~1.3.1"/>
   <plugin name="cordova-sqlite-storage" spec="6.0.0"/>
-</widget>
+</widget>

src/utils/protocol/downloadProtocol.js

@@ -2,7 +2,7 @@
 /* global FileTransfer */
 import uuid from 'uuid/v4';
 import environments from '../environments';
-import inEnvironment from '../Environment';
+import inEnvironment, { isIOS } from '../Environment';
 import { writeFile, tempDataPath } from '../filesystem';
 import friendlyErrorMessage from '../../utils/friendlyErrorMessage';
 import ApiClient from '../../utils/ApiClient';
@@ -60,9 +60,12 @@ const downloadProtocol = inEnvironment((environment) => {
       let promisedResponse;
 
       if (pairedServer) {
-        // In cordova, the cordova-plugin-network-canvas-client wants the destination
+        // on iOS, the cordova-plugin-network-canvas-client wants the destination
         // to be a folder, not a file. It assigns a temp filename itself.
-        const destination = tempDataPath();
+        //
+        // however, on android it needs to be a file.
+        const destination = isIOS() ? tempDataPath() : `${tempDataPath()}${getProtocolName()}`;
+
         promisedResponse = new ApiClient(pairedServer)
           // .addTrustedCert() is not required, assuming we've just fetched the protocol list
           .downloadProtocol(uri, destination)