Choosing a primary pdf for an entry

I have certain entries in my library which have multiple pdfs attached to them (e.g. the actual publication and the supplementary material). In some cases, the standard pdf that is openend when I double click the entry is not the one I want, but the supplemental document.
I was looking for a way to set what the primary pdf is recognized in an entry but couldnt find it. Is this possible, does anyone know?

It is not a huge issue, but id possible I'd like to change it where necessary.

Thanks!
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