Wan 2.7 produces plausible motion rather than guaranteed motion. Expect occasional identity drift across shots, unstable hands and contact points, objects that merge or pass through each other, edge flicker on fine textures, lettering that dissolves into shapes, and transitions that arrive a beat early or late. A 15-second clip gives these faults more room to appear than a three-second insert does, so inspect the full duration rather than only the opening frame.
Not every documented capability is reachable from this page. The official reference allows a prompt of up to 5,000 characters and a negative prompt of up to 500, accepts driving audio as WAV or MP3 between 2 and 30 seconds and no larger than 15 MB, and supports video continuation from a finished clip. This workspace accepts images and text only, exposes no audio control, and does not offer the reference-to-video or video-editing routes. Treat the official envelope and the panel in front of you as two different scopes.
Two official behaviours are worth planning around. Enabling prompt rewriting lets a language model expand a short prompt for better results and adds latency to the request, so a terse prompt may take longer than its length suggests. Output watermarking is off by default; when it is switched on the platform places the words AI Generated in the lower right corner of the frame, which matters if the clip is destined for a broadcast or print-adjacent context. Neither behaviour makes a clip deterministic.
Use only source images and prompts you are authorised to use, and avoid impersonation, privacy violations, trademark misuse and any presentation that passes generated footage off as recorded evidence. Keep the provenance of every asset that fed the render, and disclose synthetic video where the destination requires it. Rights in a generated clip depend on the rights you held in its inputs, not on the model that produced it.