Any advice on syncing with iOS? I use iA Writer, but the syncing experience is awful because iA Writer is waiting for some sync provider (e.g. Dropbox) to imple

Any advice on syncing with iOS? I use iA Writer, but the syncing experience is awful because iA Writer is waiting for some sync provider (e.g. Dropbox) to implement the full iOS Files API, which it appears no one has done. That leaves iCloud as the only option.