How to Send Files as Attachments or via CloudApp in Sparrow

After weeks under water, the leaf emerges. It is dry.
Tiny hairs have glued a film of air to the water fern's surface, and water could not attach.
In Sparrow, you can attach files to emails elegantly, of course, but you can also glue them to CloudApp for weeks (and more):
›› Want to send files up to 25 (or even 250) MB in size right from Sparrow without worrying about delivery issues or clogging recipients' inboxes? Here's how to attach and send files in Sparrow — both conventionally and as CloudApp uploads.