I've got a note left over from one of the earlier tests to see if uploading was fixed yet. On my desktop, all the files load show correctly. Going to any other device, they show as attached, and have placeholders, but never load. When I click "reupload" I am prompted to browse for the original on the filesystem, rather than the cached version on the working desktop app.
To reupload these I'd have to download each one individually, then reupload and browse individually - not a great UX. Is there no way to force the note just to upload what it has already?