OK, thank you. Anyway, all unsupported files should be handled in the same way. Right now that there is some response from the server success: false, response: null, but UI still shows the Loading content message. An appropriate warning should be displayed instead.
Strange, but when I tested after the “loading” message disappeared right before the error message. Anyway, these issues will be handled by our developers. We’ll add some more convenient way of the error handling. Sorry for the inconvenience.
I’m attaching a screenshot of that issue with the HTTP response. As you can see Loading content message is still displayed. (It suppose to work anyway as the file is DXF that is supported according to your docs;)