An admin wrote “file attachments are automatically purged after a few months, so it is better to embed short scripts directly”, but I have no idea what “to embed scripts” means…
All I know it that I managed to add the attachment and it works for now…
They were talking about the file attachment to the post. The file attachments are removed from posts after a certain amount of time. So, in the future, other uses would no longer be able to download it. The suggestion was to put the code inline in the post itself so that it would be permanent.