There is something wrong with Venera.social when posting pictures. The images aren't being shown on other Friendica instances (tested on Libranet.de) and on Mastodon they are shown as a link instead of a picture.
On my profile there are some examples. It has worked previously so it's a new issue.
@anders@venera.social@support@libranet.de I'll have a look. Probably it's a permission issue. There's a privacy setting to make images always accessible when attached to a post. You could try to enable that.
It's unlikely that this is a new issue because nothing has changed on venera.social in the last 4 weeks.