Me too, I highly recommend Hetzner Storage Box. It's cheap, and it works great (unlike their S3-compatible storage, which has been a huge fiasco since they launched it).
I still have to check if this actually works in practice, but I am hopeful. I based it off their documentation here: https://docs.hetzner.com/storage/object-storage/faq/s3-crede...
The main problem is that it sometimes slows down to a crawl, or requests fail altogether.