Color Profile for CMYK files

[SheaPrints]

Does anyone know which color profile Zazzle prefers for a CMYK file saved as a tiff, svg or pdf?
I can't find any info about this on the guidance page:
https://help.zazzle.com/hc/en-us/articles/31818643206807-Zazzle-Print-Colors-Guidance

[Cat]

I had an email conversation with someone from the quality control team a while back and he said tiff was the best choice - but I think he was referring to raster graphics. For vectors I'm guessing svg would be preferable since pdfs can sometimes include embedded raster images and that could get messy, but I'm not really sure.

[Cat]

Oh wait... I think I misunderstood your question. I have no idea about CMYK color profiles.

[SheaPrints]

Thanks Cat! Yes, I'd like to know if Zazzle suggests a specific color profile for CMYK files. Different product printers will use different profiles and convert them, but knowing which one they prefer us to start with would be helpful.

Also, I noticed that the RGB format is still being recommended on the Zazzle 'Design Tips'>'Creating and uploading images to Zazzle':
https://help.zazzle.com/hc/en-gb/articles/219861927-Creating-and-uploading-images-to-Zazzle

But I understand that CMYK is now the preferred format?

[idraw]

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