Check browser support and model loading when background removal fails before it can analyse the selected photo.
Separate setup failure from a bad mask
An engine-start error means the local processing system did not become ready. It is different from a completed result with inaccurate edges. The tool needs browser capabilities including WebAssembly and workers, plus successful access to its runtime and model files. An outdated or restricted browser may fail before the image is analysed.
Try a focused recovery
Open the page in a recent mainstream full browser rather than an embedded app window. Check that the connection can load the site completely. Close unnecessary heavy tabs if memory is tight, then retry one small supported photograph. Do not disable security protections indiscriminately; if a managed device blocks the required features, use an appropriate permitted device or editing workflow.
A model download that failed halfway can produce a similar user-visible failure to unavailable processing support. The status text and whether the download stage completed help distinguish them, but visitors are not expected to diagnose runtime internals.
Keep expectations clear
The tool should display an error, not invent a successful result. Your selected photograph is not sent to a remote service as a hidden fallback. If local processing remains unavailable, keep the original and try another browser or a different tool knowingly. A smaller file can help memory usage, but it cannot add missing browser capabilities.