We’ll enable adding mailto syntax formatted links (mailto:firstname.lastname@example.org) in the FilePicker via the “From a link” tab. This is already supported in the Page picker (Ctrl+K) in the rich text editor (RTE) on modern pages.
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Any site that needs a Contact Us mail link. Essential. Please enable this for both Quicklinks and Image links. It seems it used to be available in earlier versions of SharePoint !