When installing the MassTransit Web Assistant application, either using the "Get the latest version of the plug-in" link on the web page of a MassTransit server, in a web browser or by downloading the installer from the MassTransit latest releases page, while the MassTransit Web Assistant and the MassTransit web browser extension for Chrome are successfully installed, the web browser extension is not automatically enabled.
In Chrome, navigate to the Extensions page (Menu -> More Tools -> Extensions) and manually enable the MassTransit web browser extension. After reloading the webpage, the MassTransit Web Assistant application can be used to send files.
NOTE: If the MassTransit web browser extension for Chrome is removed using the Remove button on the Chrome Extensions page, the only way to reinstall it is through the Chrome Web Store by searching for the MassTransit Web Extension. This step will also automatically enable the MassTransit web browser extension in Chrome.