I have an issue with proton. I hosted the software on my own homeserver with portainer.
Often it comes the failure "TypeError: NetworkError when attempting to fetch resource."
or
in photon. It doesnt work in Firefox (Mac) or Safari (iOS, MacOS).
The instance is not the problem. It works with voyager.
This is for other frontends, but I remember reading something about image uploads not working when you're self-hosting due an issue with CORS. I don't know what CORS is, really, so can't expand on it. It may be that you need to upload the image to a filehost like postimages.org and link to the inline version of that instead.
Thank you for your answer. But there is also the problem that the communities doesn’t load.