Hey, I have an order but it doesn't seem to import to PrimtShrimp even though the sku is identical and I've integrated. Any idea?

Hello! I'm new here and prepping to open a poster shop on Etsy. Stumbling a bit on enhancing my images to 300DPI - does anyone have any good recommendations? I looked at Upscayl as seen that's getting a lot of love, but the app reviews are poor and you have to pay £13 (would rather try something for free or minimal cost first to get going and see how I get on). Thanks :)

11 days in and I have my first order from the down under 🇦🇺.

I've been wondering for ages and I am finally asking. Does it matter that I convert all my posters to 300dpi after upscaling or can I just leave it? I have just accidentally send a poster off for printing with the wrong version of the poster that is incredibly high detail but has 72dpi in its metadata instead of 300, does this matter.

I listed my first poster on Saturday and yesterday (Friday) I got my first sale! Very happy to have made a sale within my first week 🥳