It would be nice if we could change the order that a feature's attachments show up.
A specific use case where it's a pain that this is not possible is in a public facing Attachment Viewer style Instant App. It displays the municipality's parks, and I want to have the park's sign be the first image that shows up. We've been upgrading the park signs recently, and I try to just replace the existing park sign image with a new image, but the new park sign image ends up being the last picture to show up. So then I end up deleting all of the pictures (which in some cases is up to a dozen pictures), and re-adding them in the order I want. It's a massive pain to do this process every time a new sign gets put up, or a playground gets upgraded.