Share used to copy the link straight away, leaving no way to send it
anywhere. It now opens a menu with the link and Copy, Open, X, Telegram
and WhatsApp, plus the link options. The ⋯ menu's "Copy public link"
still copies in one step.
A person opening a single-file link in a browser used to get the bare
file, with nothing saying where it came from. Browser visits now get a
page with a preview, Download and Open, and links to pithos.sia, the
Pithos app and Theseus Navigator; folder pages carry the same links.
Players, embeds and download tools still get the file itself (?raw,
?dl, or any request that is not a page navigation).
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