Another question to double check. The KDP bleed specifications say:
If you want your images to bleed to the edges of your pages, extend them 0.125” (3 mm) beyond the final trim size from the top, bottom, and outer edges for your manuscript, and on all edges for a cover file.
Format your PDF manuscript at 0.25” (6 mm) higher and 0.125” (3 mm) wider than your selected trim size in order to print the full bleed area.
In InDesign, does this mean adding 0.25 to the overall width of the spread, that is, add half of that to right and left - 0.125 bleed added to the left, and 0.125 bleed added to the right? Or add 0.25 bleed to right, and 0.25 to left?
And the same for the height - 0.5 higher, 0.25 added to the top, and 0.25 added to the bottom, or 0.5 added to top, and 0.5 added to bottom? I'm starting to confuse myself.