With inspiration from the Podpro project, I’ve created in Svelte (yet another) text editor app based on the VS Code Monaco editor. This editor has support for passing a resource URL by reference (or creating a new resource by passing a non-existing resource). It used ETag cache validation checks.
One can send a friend a request to edit a file this way (when the ACL-s allow it, of course).
Would be nice to have a small app that only updates the ACL-s of a resource.