If you have more text than will fit into one text frame, you can use any of the following options to accommodate the text.
The AutoFlow feature lets you flow text through newly created text frames (of identical dimensions) on pages after the page containing your overflowing text frame.
If there's too much story text to fit in a frame sequence, Affinity Publisher stores it in an invisible overflow area. To indicate overflow, a Text Flow button (triangle icon) changes to red; an adjacent eye icon also appears which lets you show or hide the overflowing text.
By long pressing this Text Flow button the displayed AutoFlow option, when tapped, will automatically flow text into new text frame in different ways.
AutoFlow is a "one-off" operation. If you add more text to a story while editing, or have reduced the size of a frame, you may find that an overflow condition crops up. In this case you can decide whether to initiate an autoflow again or use a text sizing option. If you reduce the amount of text in the story, empty frames will remain on the page.
Text frames, of same dimensions and properties, are created on multiple new pages until text overflow no longer occurs.