Update README.md

android-builder-docker/README.md

@@ -45,6 +45,9 @@ repo sync -c -j$(nproc)
 
 # get latest Dockerfile from Redroid repository
 wget https://raw.githubusercontent.com/remote-android/redroid-doc/master/android-builder-docker/Dockerfile
+
+# check if 'Webview.apk' files were properly synced by 'git-lfs'. Each .apk should be at least ~80MB in size.
+find ~/redroid/external/chromium-webview -type f -name "*.apk" -exec du -h {} +
 ```
 #### 3) GApps (optional)
 ##### In case you want to add GApps to your build (PlayStore, etc), you can follow these steps, otherwise, just skip it