diff --git a/bin/server.dart b/bin/server.dart
index 3e966d3..481eecc 100644
--- a/bin/server.dart
+++ b/bin/server.dart
@@ -98,8 +98,8 @@ Future<void> _postOnMastodon(reqJson) async {
   // If there are more than four photos, move other photos to another array to be posted in the thread.
   List<String> otherPhotos = [];
   if (photoUrls.length > 4) {
-    otherPhotos = photos.skip(4).toList();
-    photoUrls = photos.take(4).toList();
+    otherPhotos = photoUrls.sublist(4);
+    photoUrls = photoUrls.sublist(0, 4);
   }
 
   // Post the post on Mastodon.
@@ -143,8 +143,8 @@ Future<void> _postOnMastodon(reqJson) async {
     while (otherPhotos.isNotEmpty) {
       mediaIds = [];
       if (otherPhotos.length > 4) {
-        otherPhotos = otherPhotos.skip(4).toList();
-        photoUrls = otherPhotos.take(4).toList();
+        otherPhotos = photoUrls.sublist(4);
+        photoUrls = photoUrls.sublist(0, 4);
       } else {
         photoUrls = otherPhotos;
         otherPhotos = [];