Make a new document: 2 pages, 3 columns.
Double click A-Master to navigate to the master pages. Use the Type tool to draw a text frame in the bottom margin of the left hand page.
Add the page number with Type > Insert Special Character > Markers > Current Page Number. An "A" will appear because you are on the A-Master. Format as desired, set the Alignment to Left. Select the frame and Alt/Opt+Sh+drag the frame to the facing page. (Alt/Opt will duplicate the original frame, Shift maintains the same horizontal plane.) Change the Alignment of the "A" in the right page frame to Align Right.
Check page 1.
Check page 2.
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The second page will have a facing page with an image, again with an outward page number.
This makes it sound like maybe you wanted three pages? If so, either create a 3-page document or just click the Create New Page button at the bottom of the Pages panel, the numbers will work automatically.
Can I just align the page number away from the spine, thus keeping to one, 3-col page for my index??
Perfect, thank you, Barb.
Always happy to help, Jack.