This is possibly a bug, but in general we don't completely test as to what gets enabled/disabled when subscriptions expire. It's quite rare that people keep their servers around when subscription expires. But I will test things out when we cut a new release.

@jlx89 You can just create that directory. It's customizable now with notfound.html - https://docs.cloudron.io/branding/#custom-pages

@mdreira probably a long term solution to embed images is to also embed it inline in the html. You can use a tool like https://base64.guru/converter/encode/image/png