show copied message when asset copied

app/mobile/src/session/conversation/topicItem/binaryAsset/BinaryAsset.jsx

@@ -48,6 +48,11 @@ export function BinaryAsset({ asset, dismiss }) {
         { state.downloading && (
           <ActivityIndicator color={Colors.white} size="large" />
         )}
+        <View style={styles.copied}>
+          { state.copied && (
+            <Text style={styles.copiedText}>Copied to App Directory</Text>
+          )}
+        </View>
       </View>
       <Text style={styles.extension}>{ asset.extension }</Text>
     </View>

app/mobile/src/session/conversation/topicItem/binaryAsset/BinaryAsset.styled.js

@@ -26,6 +26,14 @@ export const styles = StyleSheet.create({
     alignItems: 'center',
     justifyContent: 'center',
   },
+  copied: {
+    height: 32,
+    paddingTop: 8,
+  },
+  copiedText: {
+    color: Colors.white,
+    fontSize: 18,
+  },
   extension: {
     textAlign: 'center',
     fontSize: 48,

app/mobile/src/session/conversation/topicItem/binaryAsset/useBinaryAsset.hook.js

@@ -12,6 +12,7 @@ export function useBinaryAsset() {
     width: 1,
     height: 1,
     downloading: false,
+    copied: false,
   });
 
   const dimensions = useWindowDimensions();
@@ -45,7 +46,8 @@ export function useBinaryAsset() {
             src = blob.path();
           }
 
-          if (Platform.OS === 'iOS') {
+          if (Platform.OS === 'ios') {
+
             const path = `${RNFetchBlob.fs.dirs.DocumentDir}`
             const dst = `${path}/${label}.${extension.toLowerCase()}`
             if (RNFetchBlob.fs.exists(dst)) {
@@ -61,8 +63,10 @@ export function useBinaryAsset() {
             RNFetchBlob.fs.unlink(dst);
           }
           else {
-            const copy = RNFS.ExternalDirectoryPath + "/" label + "." + extension;
+            const copy = RNFS.ExternalDirectoryPath + "/" + label + "." + extension;
             RNFS.copyFile(src, copy);
+            updateState({ copied: true });
+            setTimeout(() => updateState({ copied: false }), 2000);
           }
           updateState({ downloading: false });
         }