problems with exporting to pdf

I create posters for an organization which uses png files for the logos. When I export the posters to pdf for printing, the quality of the png files is severly degraded and appears very pixelated. I've tried several tweaks, but nothing seems to affect the end result. Not sure how to solve the problem - I have recently purchased Corel Draw 2024, and thought it would fix this issue, but it hasn't. 

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