Currently it is not possible to update attachments for test scenarios or folders. The only possiblity is to upload the updated version of the attachment and remove the existing one.
Since we want to show screenshots in the descriptions for our scenarios and folders, we attach them and use Markdown to embed the images within the description.
When the screenshots needs to be updated, all the permalinks to the attachment has to be changed, since uploading a new version of the image is required (and this attachment has a new link).
It would be very helpful if updating an existing attachment (without it’s permalink getting changed) would be possible!