Drop a PDF on the previous screen to begin.
Other converters keep the page layout, so the text lands on top of itself. Reflow rebuilds the paragraphs, chapters and figures instead.
Text and images only — hand-set layout, tables and multi-column pages won't survive intact. A scanned PDF has no text layer at all and needs OCR before any converter can read it.
Drop a PDF on the previous screen to begin.
Your EPUB is in your downloads. Side-load it and it should open with its contents, cover and figures intact. Thanks for giving Reflow a run.