When iOS delivers a file via "Open In…", expo-router strips the
docuelevate:// scheme and routes to +not-found.tsx. Previously, this
screen only redirected to the Upload tab and relied on the Linking
handler in _layout.tsx to add the file to ShareContext. This was
unreliable because expo-router may consume the URL event before the
Linking handler fires.
Now +not-found.tsx directly reconstructs the file:// URI from the
pathname and adds it to ShareContext before redirecting. ShareContext
deduplicates by URI to prevent double uploads if both mechanisms fire.
Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>
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