When sending an attachment, it misleads the sender: the checkmark indicating successful delivery to the server appears immediately. Apparently, the attachment’s text part is delivered to the server first, and the client interprets this as successfully delivered — even when the attachment text is empty. As a result, the recipient sees a banner saying the video can be downloaded, even though it hasn’t actually been uploaded to the server yet.
This bug appeared in version 2.43, after the issue with an empty message arriving before the attachment was fixed.
Moreover, this happens even when the setting for automatic download of attachments of any size is enabled.