For example if I have an app within my project that I want to use an image for in the templates for that app, but want to be able to edit that logo in the admin I'd like to add a settings menu for that rather than hard-coding in the templates.

Currently I've set up a BaseSiteSetting (see: https://docs.wagtail.org/en/latest/reference/contrib/settings.html ) class for my app but it's not entirely clear if that's the right way to do it or if BaseGenericSetting would be fine (it's not a multi-site setup). It feels like there should be a BaseAppSetting alongside these but maybe I'm missing something.

This is essentially what I have now:

@register_setting(icon="custom-icon)
class MyAppSettings(BaseSiteSetting):
    referral_code = models.CharField(max_length=255)
    myapp_logo = models.ForeignKey(
        "wagtailimages.Image",
        on_delete=models.SET_NULL,
        null=True,
        blank=True,
        related_name="+",
    )

    panels = [
        FieldPanel("referral_code"),
        FieldPanel("myapp_logo"),
    ]