Resolution vs scale vs file size for printing

Hi there, having done some research on here I'm still looking for a definitive answer about the file size, pixel resolution or scale the final file I send to Print shrimp for printing.

Let's assume I want to print an A0 size poster. My file that I designed in Canva is a PNG file - is this ok or should it be jpeg? Knowing it's a poster design I think Canva defaults to a PNG rather than JPEG - which is better?

The current file size is 25.2MB with pixel dimensions of 7016 x 9933. Is this large enough (in any sense) for a clean, crisp quality A0 poster print shrimp?

Or do I need to upscale it? It's not very clear which is the most important factor with regards file size/resolution and therefore quality required for a successful large poster print.

Id welcome any real clarity around this. Thanks in advance guys.

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