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Client-side only: every file is still its own standard m.image/m.video event, so Element and friends keep seeing N plain images. In Lotus a run of media from one sender — contiguous, ≤ 60 s apart, no reply/thread/edit relation, up to 10 — renders once, at its last event, as a 2–4 column grid of square thumbnails (blurhash placeholder, video play badge, tap-to-load when media auto-load is off). A member with reactions or a thread closes its group so those stay visible under the rendered event. Tapping a tile opens the lightbox on just that group in send order (←/→, zoom, download, jump). "Show separately" splits a group back into individual messages for the session; "Show as gallery" undoes it. Planning is lazy per render pass (utils/mediaGroups.ts, unit-tested): the first media event met plans its whole run in both directions, so a virtual window that starts mid-run agrees with one that starts before it. Verified: 5 files dropped at once in an encrypted room — both sender and recipient see one 5-tile grid with decrypted thumbnails; desktop + phone; a reaction on photo 3 yields [1–3]+👍 and [4–5]. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01PPmy3tPq869XDW4njjVaKA