diff --git a/core/admin/mailu/ui/templates/fetch/create.html b/core/admin/mailu/ui/templates/fetch/create.html
index 69584d15..a48c1a48 100644
--- a/core/admin/mailu/ui/templates/fetch/create.html
+++ b/core/admin/mailu/ui/templates/fetch/create.html
@@ -25,7 +25,9 @@
   {%- call macros.card(title="Settings") %}
   {{ macros.form_field(form.keep) }}
   {{ macros.form_field(form.scan) }}
+{%- block folders %}
   {{ macros.form_field(form.folders) }}
+{%- endblock %}
   {%- endcall %}
 
   {{ macros.form_field(form.submit) }}
diff --git a/core/admin/mailu/ui/templates/fetch/edit.html b/core/admin/mailu/ui/templates/fetch/edit.html
index 62af51a9..c7ff5a87 100644
--- a/core/admin/mailu/ui/templates/fetch/edit.html
+++ b/core/admin/mailu/ui/templates/fetch/edit.html
@@ -7,3 +7,15 @@
 {%- block subtitle %}
 {{ user }}
 {%- endblock %}
+
+{%- block folders %}
+<div class="form-group">
+    <div class="row">
+      <div class="col-lg-12 col-xs-12 ">
+
+    <label for="folders">Folders to fetch on the server</label>
+      <input class="form-control" id="folders" name="folders" type="text" value="{{ form.folders.data|join(',') }}">
+      </div>
+    </div>
+  </div>
+{%- endblock %}
diff --git a/core/admin/run_dev.sh b/core/admin/run_dev.sh
index 4ab76e74..c12bb9ee 100755
--- a/core/admin/run_dev.sh
+++ b/core/admin/run_dev.sh
@@ -48,7 +48,7 @@ sed -E '/^#/d;s:^FROM system$:FROM system AS base:' "${base}/Dockerfile" >Docker
 
 # assets
 cp "${assets}/package.json" .
-cp -r "${assets}/assets/" .
+cp -r "${assets}/assets" ./assets
 awk '/new compress/{f=1}!f{print}/}),/{f=0}' <"${assets}/webpack.config.js" >webpack.config.js
 sed -E '/^#/d;s:^(FROM [^ ]+$):\1 AS assets:' "${assets}/Dockerfile" >>Dockerfile
 
@@ -65,7 +65,7 @@ RUN set -euxo pipefail \
   ; ln -s /app/start.py /
 
 ENV \
-    FLASK_ENV="development" \
+    FLASK_DEBUG="true" \
     MEMORY_SESSIONS="true" \
     RATELIMIT_STORAGE_URL="memory://" \
     SESSION_COOKIE_SECURE="false" \
@@ -82,7 +82,7 @@ ENV \
     REDIS_ADDRESS="127.0.0.1" \
     WEBMAIL_ADDRESS="127.0.0.1"
 
-CMD ["/bin/bash", "-c", "flask db upgrade &>/dev/null && flask mailu admin '${DEV_ADMIN/@*}' '${DEV_ADMIN#*@}' '${DEV_PASSWORD}' --mode ifmissing >/dev/null && flask run --host=0.0.0.0 --port=8080"]
+CMD ["/bin/bash", "-c", "flask db upgrade &>/dev/null && flask mailu admin '${DEV_ADMIN/@*}' '${DEV_ADMIN#*@}' '${DEV_PASSWORD}' --mode ifmissing >/dev/null; flask run --debugger --host=0.0.0.0 --port=8080"]
 EOF
 
 # build