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In general, you can sell the file, but don't expect someone to pay for information that can be obtained for free.
That's right, anyone can go to a swap service for free and make the exchange, a good example for this is the next site:
https://altquick.com/swap/I have used their service in the past and worked fine for me. I feel like there is no reason to pay 0.1 to op and get a pdf file that could contain a malware, the risk of getting scammed or exploited doesn't worth it.
I remember in the past it was possible with Atomic wallet, but if i'm not wrong they remove that coin from their swap service.