A footnote consists of two linked parts: the footnote reference number that appears in text, and the footnote text that appears at the bottom of the column. You can create footnotes or import them from Word or RTF documents. Footnotes are automatically numbered as they are added to a document. Numbering restarts in each story. You can control the numbering style, appearance, and layout of footnotes. You cannot add footnotes to tables or to footnote text.
For a video on creating footnotes, see www.adobe.com/go/vid0218.
As you type, the footnote area expands while the text frame remains the same size. The footnote area continues to expand upward until it reaches the line with the footnote reference. At that point, the footnote is split to the next text frame column or threaded frame, if possible. If the footnote cannot be split and if more text is added than can fit in the footnote area, the line containing the footnote reference is moved to the next column, or an overset icon appears. In such a case, you should resize the frame or change the text formatting.