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Hello,

It is maybe late, but will help some users.

In addition to "ps8modules.com" answer, you also need to change the function isCorrectImageFileExt on the "./classes/ImageManager.php" file:

After this code:

        // Filter on file extension
        if ($authorizedExtensions === null) {
            $authorizedExtensions = ['gif', 'jpg', 'jpeg', 'jpe', 'png', 'webp'];
        }

Add this:

        if(!in_array('webp', $authorizedExtensions)){
            $authorizedExtensions[] = 'webp';
        }

Good luck