免责声明:看不懂请前往Google翻译。
(Corresponding translation) Disclaimer: If you don't understand me, go to Google Translate.
To upload images, try this extension.
Bugs are normal. You know, even the simplest program——Hello, World!, has bugs as well.
Otherwise, you can upload it to a third-party server and reference it like this:

Code:

This is not a file from that third-party server because something went wrong while uploading images there.
If you want Flarum to be compatible with IE, I have a great idea! You can render webpages on a server with the latest browser and display the screenshots on IE. This website once had a similar service.