Can it format images, tables, footnotes, or poetry?
The Interior Formatter is built for prose — running text in chapters, which covers novels, memoir, and most narrative nonfiction. Here's where each of the harder cases actually stands.
Images — yes
Pictures in your DOCX are carried into both the print PDF and the EPUB. The formatter sorts them into scene-break ornaments, inline figures, and full-page plates, and gives you controls for captions, which side a full-page picture starts on, how far it reaches, and whether it fits or fills. Any single picture can be overridden on its own.
Full details: How are pictures in my manuscript handled? and Scene breaks and ornaments.
What this still isn't is page-design software. A photo book, a children's picture book, or an illustrated cookbook — anything where the pictures drive the layout and text flows around them — wants a dedicated layout program. The formatter sets your text beautifully and places your pictures correctly; it does not design spreads.
Tables — simple ones only
A short, plain table can come through. Anything that depends on merged cells, nested tables, rotated headers, or a table wider than the measure will not survive into a narrow book page in a form you'd want to print. Reference books built on tables are not a good fit.
Footnotes — no
Footnotes and endnotes aren't reliably supported. If your book depends on extensive noting, use a layout program built for it.
Poetry — with care
Verse can be set, but line breaks in poetry are meaning, not spacing, and a prose formatter's justification and hyphenation work against that. If you're setting poetry, turn justification off (ragged right) and hyphenation off, keep the measure wide enough for your longest line, and read the proof carefully — a wrapped line in a poem reads as a mistake.