[Setting bleed on 3 sides for a single page spread?]

Thank you!!! Your answer has saved me a huge amount of time and effort. If this works for me then I will pass this on to IngramSpark so that hopefully they can give the next person a better answer than they gave me when this happens.

[Setting bleed on 3 sides for a single page spread?]

The printer I'm using (IngramSpark) won't accept a double page spread PDF, so I am going to have to change my Affinity Publisher file into a single page spread.

I'd like to set the bleed so it's on 3 edges, but not the gutter edge, and I can't figure out how to set this without making it a double page spread. Does anyone here know how to do this?

Will adding .125" to the document size on 3 sides do the same thing? Or does it have to be set as a bleed?

I am using Affinity Publisher 1.8.3 on a Mac.

[PDF being exported as 112 pages instead of 220]

I went through the document setup process in Affinity Publisher, and from what I can see I have set things up correctly for a 220 page document, 8.25" x 10.75" in size. I've exported it in a variety of formats, including the PDF 1a that the printer prefers, and it keeps exporting as 112 pages instead of 220.

When I took it to the local office printing place, it printed out with the first page how it should be (in portrait, 8.25" x 10.75"), and the rest of the pages were printed landscape, with two pages on every A4 page. I figured this was just an issue with that printing place, and it would all work out fine once I got the PDF 1a file to IngramSpark, but now it looks as though IngramSpark also have this issue.

Could this be happening because I have some images that stretch across a two page spread? Would it stop doing this if I cut these images up and then put them on separate pages? This would be time-consuming to do, so I'd rather avoid it, if possible.

Is there anything else that I could have done wrong to make it export like this? How can I fix it?