That would be a recent change to that site, then.
It used to be that you weren’t able to attach files to your first posts and that you needed to spend some time reading different posts, starting with the guidelines, and searching for similar issues as the one that you are having. After spending time reading posts, you would automatically be granted rights to post files.
@chris12 , can you confirm that this procedure has changed?
Sorry for the late response. All new members of Ladybug Tools forum need to at least look at a few other topics before they get the privilege to make their own post. I’m sure that McNeel discourse has something similar since this is really the only good way to defend against the torrent of bots that will spam any internet forum they can find to boost their search optimization.