Web Share API [https://w3c.io/web-share/] allows users to share links from the browser via 3rd party applications (e.g. mail and messaging apps) The problem is not very serious as user interaction is required, however it is quite easy to make the shared file invisible to the user. The issue exists on both MacOS and iOS, after selecting different methods of sharing we will get different results. A malicious website tricking users into sharing cat pictures could be used to extract sensitive information.”]
Source: https://blog.redteam.pl/2020/08/stealing-local-files-using-safari-web.html