For users that use Affinity Publisher, it's a know issue that it exports PDF files based on pixel conversion to mm, that's why it's not exact. So the trim box within the PDF file will be something like 148.10 x 210.06mm which registers an invalid page size in MagManager when you preview with trim the page.
The trim box must be 148 x 210mm (or match the page layout in MagManager) exactly for artwork that has crops marks and bleed.
Solution:
For artwork that bleeds - create a page template 154 x 216 mm (ie 148 x 210 plus 3mm bleed)
Set the margins at 13mm as a guide (ie 10mm margin plus 3mm bleed)
Export the file from Affinity as a PDF do not include bleed
Upload the artwork into MagManager and use the AutoBleed setting to bleed the artwork.
For artwork that sits inside the margin of the magazine set the page size to match the full page advert size eg 128 x 190mm based on 10mm margins.
Linkto to affinity for reference
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