Advice needed please · Poster Print on Demand

Advice needed please

Hi everyone, I'm after a bit of advice regarding upscaling artwork for printing please.

I originally started my print-on-demand journey with another supplier and have since created 108 pieces of artwork.

My process was to generate the images in ChatGPT, upload them into an A1 Canva template, and export them as JPEGs at approximately 7,016 × 9,933 pixels (300 DPI).

When I uploaded my artwork to the previous supplier, their system gave me a good quality rating, so I assumed my files were suitable for printing.

However, I've recently read a post in this community about upscaling, and it's made me question whether my images have enough genuine detail to produce sharp prints, particularly at A1. I now understand that simply increasing the pixel dimensions in Canva doesn't necessarily improve image quality.

I've ordered a few samples previously and was happy with the quality, although I can't remember whether those were exported using exactly the same process as my current JPEG files.

I've only had one Etsy order so far, and the customer hasn't received it yet, so I haven't had any feedback on the quality of my current print files. I've also ordered additional samples to check.

I've started experimenting with Upscayl, but it took around 7–10 minutes to process just one image. With 108 designs already listed on Etsy, reworking every file would be a huge task.

My question is, would it be possible to upscale and replace artwork as and when I receive customer orders, rather than updating all 108 designs immediately?

For example, if an Etsy order comes through to PrintShrimp, can I replace the artwork file attached to that specific order before paying and sending it into production?

I would also update the saved product artwork afterwards so future orders use the improved version.

Has anyone done this, or can anyone confirm whether this workflow is possible?

I'd really appreciate any advice or experiences, particularly from anyone who has used ChatGPT-generated artwork for larger prints.

Thanks in advance.

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Advice needed please