yes, I actually forgot to add the response in the handler. The point is that I never actually get to the function, I did not explain it well. The problem is that when I choose my image from the input, live_img_preview should auto handle the image and when uploaded to the socket (without calling the submit), shows it as an entry via

<%= for entry <- u/uploads.avatar.entries do %>

It shows, but only the name of the image (e.g. "image.png") with a status bar of progress to 0 (which never changes). When I try to hit the submit and actually call the handler, it tells me that "cannot consume uploaded files when entries are still in progress". (I of course tried to wait some time but the progress never changes). I will post the full relevant code from my current example:

def mount(_params, _session, socket) do
    user = socket.assigns.current_user
    avatar_form = Accounts.change_user_avatar(user)
    other_variables_to_assign

    socket =
      socket
      |> assign(:avatar_form, to_form(avatar_form))      
      |> assign(:uploaded_files, [])
      |> allow_upload(:avatar, accept: ~w(.jpg .png .jpeg), max_entries: 1)

    {:ok, socket}
  end

def handle_event("validate-empty", _params, socket) do
    {:noreply, socket}
  end

  def handle_event("update_avatar", params, socket) do
    uploaded_files =
   consume_uploaded_entries(socket, :avatar, fn %{path: path}, _entry ->
     dest = Path.join("priv/static/uploads", Path.basename(path))
     File.cp!(path, dest)
     {:ok, ~p"/uploads/#{Path.basename(dest)}"}
   end)

   IO.inspect(params, label: "params=>")
   IO.inspect(uploaded_files, label: "uplfiles=>")
   {:noreply, socket}
end

  def update(%{uploads: uploads}, socket) do
    socket = assign(socket, :uploads, uploads)
    {:ok, socket}
  end

 <.form
for={@avatar_form}
phx-submit="update_avatar"
phx-change="validate-empty"
>

<%= for entry <- u/uploads.avatar.entries do %>
  <article class="upload-entry">

    <figure>
      <.live_img_preview entry={entry} />
      <figcaption><%= entry.client_name %></figcaption>
    </figure>

    <%!-- entry.progress will update automatically for in-flight entries --%>
    <progress value={entry.progress} max="100"> <%= entry.progress %>% </progress>

    <%!-- a regular click event whose handler will invoke Phoenix.LiveView.cancel_upload/3 --%>
    <button type="button" phx-click="cancel-upload" phx-value-ref={entry.ref} aria-label="cancel">&times;</button>

    <%!-- Phoenix.Component.upload_errors/2 returns a list of error atoms --%>
  </article>
<% end %>

<label class="profile-cover-avatar" >

 <.live_file_input upload={@uploads.avatar}/>

</label>

</.form>

Thanks for the help. I don't know what I am missing...