I wrote a post in another nabble forum where I inserted a few images. I previewed the post before submitting it, and the images and links were displayed correctly in the preview. However, once posted, the images disappeared and only a sort of link with the full url to the picture appeared.
Disregard my previous response. I think something went wrong with my connection and now all three images in the original post in the topic are displaying fine.
It means I am not replicating the fault the OP describes.
Volunteer Helper - but recommending that users move off the platform! Once the admin for GregHelp now deleted.