Upscaling · Poster Print on Demand

Upscaling

Hi, sorry if this is a silly question but very new to this and trying to get my head around it all. Am I right in thinking I'm best creating a poster in the largest size and ensuring that largest size is upscaled correctly? E.g. creating in A0, ensuring 9900 x 14000 px and then all the other A sizes will be best quality print when they prepopulate in Printshrimp? Or do I need to make sure I create separate A sizes with their various pixel sizes? E.g. A4 would be 2500 x 3500 px?

Hope this question makes sense 🙈

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Upscaling