common/static/common/styles/_extension.sass

@@ -328,7 +328,7 @@
   border-radius: var(--border-radius-lg)
   border: var(--border-width) solid var(--border-color)
   display: flex
-  +padding(1, y)
+  +padding(2, y)
 
   .previews-list-item-thumbnail
     margin: 0

extensions/templates/extensions/manage/components/add_previews.html

@@ -1,8 +1,7 @@
 {% load common %}
 {# Upload new preview images #}
 {% load i18n %}
-<div class="previews-upload">
-  <div id="add-img-container" class="previews-list">
+<div id="add-img-container" class="previews-list">
   {{ add_preview_formset.management_form }}
   {{ add_preview_formset.non_form_errors }}
   {% for newform in add_preview_formset %}
@@ -34,7 +33,6 @@
       {{ inlineform.non_form_errors }}
     {% endwith %}
   {% endfor %}
-  </div>
 </div>
 <div class="row">
   <div class="col text-right mt-3">