The charts are sometimes working for me on the mobile app from a remote URL. The mobile app with the local URL works perfectly fine for me everytime. e.g.
On mobile app using the remote url
I see the same problem, additionally I have problems when trying to show two images on the sitemap ( one locally stored the other from the internet) . I get the the same image displayed for both ( either the local one or the Internet one). Trying the same when connected to my local net net I get the two different images.