Remarkup's file embed syntax `{Fxxx,layout=inline}` is not actually rendered inline. Observe:
some text {F285134,layout=inline} more text
That's because the generated HTML is `<p>some text <div …>…</div> more text</p>`, and HTML `<p>` tags may not contain block content like `<div>` tags. Browsers actually parse this as if it was `<p>some text </p><div …>…</div> more text<p></p>` (sic).