update changelog and leave a note

CHANGELOG.md

@@ -25,7 +25,9 @@
   * emojis in cursor tooltips for guests (rich text, code, slide, kanban)
   * emojis in the share and access modals for contacts with empty names
 * script to identify unnecessary duplication of translations
-
+* improvements to upload and media-tag UI
+  * support for adding descriptive text at upload time
+  * preview of uploaded media in the upload modal
 
 ## Bug fixes
 

customize.dist/src/less2/include/modals-ui-elements.less

@@ -277,6 +277,9 @@
         max-width: 100%;
         max-height: 300px;
         overflow: auto;
+        // XXX these styles yield weird results for tall, thin images
+        // maybe img { object-fit: contain; } or scale-down are options
+        // but they have problems too
         media-tag {
             max-width: 100%;
             iframe {