Add note about lack of proper support for webkitdirectory on mobile #24543
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Summary
It's "supported" in that it is recognized by the browser but there is no code in the file chooser interface on mobile phones to allow selection of a directory when using it.
Test results and supporting details
I tried using this option on a phone and there was no way to choose a folder to upload.
https://bugs.webkit.org/show_bug.cgi?id=271705
https://issues.chromium.org/issues/40248532
https://bugzilla.mozilla.org/show_bug.cgi?id=1887878
Related issues
Fixes #24357