diff --git a/templates/fediplan/schedule.html.twig b/templates/fediplan/schedule.html.twig
index 11874b0..c6e94b2 100644
--- a/templates/fediplan/schedule.html.twig
+++ b/templates/fediplan/schedule.html.twig
@@ -414,7 +414,7 @@
                     var content;
                     content = ' <div class="row" id="media_container_'+data.id+'">\n' +
                     '                <div class="col-md-4">\n' +
-                    '                    <img src="'+data.preview_url+'" style="width:100%;max-width:400px;" id="media_preview_'+data.id+'"/>\n' +
+                    '                    <img src="'+data.preview_url+'" style="width:100%;max-width:200px;" id="media_preview_'+data.id+'"/>\n' +
                     '                </div>\n' +
                     '                <div class="col-md-6">\n' +
                     '                    <textarea name="media_description_'+data.id+'" class="form-control"></textarea>\n' +
@@ -428,11 +428,11 @@
                     '                </div>\n' +
                     '            </div>'
 
-                    $('#media_container').html($('#media_container').html() + content);
+                    $('#media_container').append($(content));
 
                 },
                 url: 'https://{{ instance }}/api/v1/media',
-                acceptFileTypes: /(\.|\/)(gif|jpe?g|png|mp4|mp3)$/i
+                acceptFileTypes: /(\.|\/)(gif|jpe?g|apng|png|mp4|mp3|avi|mov|webm|wmv|flv|wav|ogg)$/i
             });
 
             // Enable iframe cross-domain access via redirect option: