I needed a reliable place to type text without being presented with autocompleted entries or suggested searches . . . so I solved the problem myself.
Anything under 10 megabytes (or that can be compressed or re-encoded to fit under the limit) can be uploaded. Me and my friend @Gilbert189 regularly share files uploaded over Scratch Assets, including (re-encoded) video files. Besides, the Xcode project is relatively small, with little more than the default SwiftUI project template.
It’s kind of a bad idea for the ST to have that though, because what if people start using to share bad stuff?