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@hybridherbst @ChromeDev @googlechrome The spec makes no restrictions: w3c.github.io/web-share/#ref-for-dom-sharedata-files-1:~:text=If-,a,-file%20type%20is
If a file type is being blocked due to security considerations, return a promise rejected with a "NotAllowedError" DOMException.
So adding new file types is a UA thing. Open a new.crbug.com I guess and ask?