public/manifest.json declares share_target (POST multipart to /share-target: title/text/url + image/video/audio/pdf/text files). The service worker answers that POST itself: it stashes the form in a Cache API bucket and 303s to the in-app /share page, which lists what arrived, offers a room search, and on pick writes the files into that room's upload-board atom (encrypting first for E2EE rooms via the composer's shared filesToUploadItems) and the title/text/url into its draft, then opens the room — the user still presses Send. The stash is cleared once placed; reopening /share afterwards says so. nginx/caddy examples and the prod image config gain a 303 for /share-target so a POST that reaches the origin before the worker controls the page lands on /share instead of a 405. iOS has no share target support and ignores the manifest entry. Verified headless against the built preview: SW-controlled page → POST /share-target (two PNGs + title + text) → /share lists both files and the text → pick the DM → composer shows both files on the upload board and the text in the draft → /share reports nothing pending. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01PPmy3tPq869XDW4njjVaKA
nginx configuration
Insert wasm type into nginx mime.types file so they load correctly.
/etc/nginx/mime.types:
types {
..
application/wasm wasm;
..
}