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Look at the PDF carefully before sharing it. Most academic publishers put a timestamp on it that reveals who downloaded it, at least at institution level. Sometimes this is even embedded as metadata. If the PDF says anywhere “author personal copy”, please don’t share it on the author’s behalf.

This is mostly to avoid getting them into trouble.

Otherwise, go and share, authors love it!

Put.io only has torrents, though. There’s also premiumize.me which has torrents, Usenet, and some DDL. It has been a bit of hit and miss for DDL, though.

Speaking of, it’s been a while since I’ve looked at these downloaders. What are the most recent and good ones?

In case nginx does not work out for you, you can opt for more generic reverse proxies. frp is my favorite one: https://github.com/fatedier/frp

See https://github.com/anderspitman/awesome-tunneling