Let's say I took the time to convert into proper modern LaTeX a few old math papers (which cannot be found online, or only in poorly scanned versions which are hard to read due to this). If someone else happened to want to read them, I would be happy to spare them some time by sharing my versions. Where would you upload such files?
Note that the case I am considering here is merely a one-to-one LaTeX transcription of the original papers, without any improvement to the text or the math (say, except some typos fixed maybe). In particular, I do not have and do not want to claim any type of ownership on this content.