Adjust spacing between main text and footnote in beamer slides

Question

How does one tweak (preferably on an individual slide basis, instead of applying to all slides) the spacing between the main text and the footnote in beamer slides.

For example, in the following slides, I've tried tweaking the \skip\footins but it doesn't seem to have much effect on Slide 1 where I'd like to have a bit more space between Item 11 and the footnote line/text

\documentclass{beamer}
\addtolength{\skip\footins}{4pc plus 8pt}
\usetheme{metropolis} % Use metropolis theme}
\title{A minimal example}
\date{\today}
\author{Matthias Vogelgesang}
\institute{Centre for Modern Beamer Themes}
\begin{document}
    \maketitle
    \begin{frame}{First Slide}
        \begin{itemize}
            \item Item 1
            \item Item 2
            \item Item 3
            \item Item 4
            \item Item 5
            \item Item 6
            \item Item 7\footnote{Some footnote}
            \item Item 8
            \item Item 9
            \item Item 10
            \item Item 11
        \end{itemize}
    \end{frame}
    \begin{frame}{Second Slide}
        \begin{itemize}
            \item Item 1
            \item Item 2
            \item Item 3
            \item Item 4
            \item Item 5
            \item Item 6
            \item Item 7\footnote{Some footnote}
            \item Item 8
            \item Item 9 
        \end{itemize}
    \end{frame}
\end{document}

Answer 1

If you only want to tweak some selected slides, you could just add a \vspace.

\documentclass{beamer}
\addtolength{\skip\footins}{4pc plus 8pt}
\usetheme{metropolis} % Use metropolis theme}
\title{A minimal example}
\date{\today}
\author{Matthias Vogelgesang}
\institute{Centre for Modern Beamer Themes}
\begin{document}
    \maketitle
    \begin{frame}%[t]
    \frametitle{First Slide}
        \begin{itemize}
            \item Item 1
            \item Item 2
            \item Item 3
            \item Item 4
            \item Item 5
            \item Item 6
            \item Item 7\footnote{Some footnote}
            \item Item 8
            \item Item 9
            \item Item 10
            \item Item 11
        \end{itemize}
        \vspace*{5mm}
    \end{frame}
    \begin{frame}%[t]
    \frametitle{Second Slide}
        \begin{itemize}
            \item Item 1
            \item Item 2
            \item Item 3
            \item Item 4
            \item Item 5
            \item Item 6
            \item Item 7\footnote{Some footnote}
            \item Item 8
            \item Item 9 
        \end{itemize}
    \end{frame}
\end{document}

Answer 2

do you looking for something like this?

\documentclass{beamer}
\usetheme{metropolis}   % use of the metropolis theme:
                        % it breaks standard placement
                        % of footnotes (at bottom of a frame)
\setbeamertemplate{footline}{}% <---

\setbeamertemplate{footnote}{ % <---
  \makebox[1em][l]{\insertfootnotemark}%
  \begin{minipage}{\dimexpr\linewidth-1em}
    \footnotesize\linespread{0.84}\selectfont\insertfootnotetext
  \end{minipage}\vskip 0pt 
                            }% end of footnote template

\title{A minimal example}
\date{\today}
\author{Matthias Vogelgesang}
\institute{Centre for Modern Beamer Themes}

\begin{document}
    \maketitle
\begin{frame}
\frametitle{First Slide}
    \begin{itemize}
        \item Item 1
        \item Item 2
        \item Item 3
        \item Item 4
        \item Item 5
        \item Item 6
        \item Item 7\footnote{Some footnote}
        \item Item 8
        \item Item 9
        \item Item 10
        \item Item 11
    \end{itemize}
\end{frame}

\begin{frame}
\frametitle{Second Slide}
    \begin{itemize}
        \item Item 1\footnote{test}
        \item Item 2
        \item Item 3
        \item Item 4
        \item Item 5
        \item Item 6
        \item Item 7\footnote{Nunc sed pede. Praesent vitae lectus. Praesent neque justo,
                              vehicula eget, interdum id, facilisis et, nibh.}
        \item Item 8
        \item Item 9
    \end{itemize}
\end{frame}
\end{document}

Answer 3

In Beamer, this distance is adjusted by \skip\@mpfootins, for example:

\makeatletter
\skip\@mpfootins0pt
\makeatother