diff --git a/activitypub.py b/activitypub.py
index b5ed7c9..55ba6ce 100644
--- a/activitypub.py
+++ b/activitypub.py
@@ -18,6 +18,8 @@ from config import ID
 from config import ME
 from config import USER_AGENT
 from config import USERNAME
+from config import MEDIA_CACHE
+from utils.media import Kind
 from little_boxes import activitypub as ap
 from little_boxes import strtobool
 from little_boxes.activitypub import _to_list
@@ -87,6 +89,14 @@ class MicroblogPubBackend(Backend):
             }
         )
 
+        # Generates thumbnails for the actor's icon and the attachments if any
+        actor = activity.get_actor()
+        if actor.icon:
+            MEDIA_CACHE.cache(actor.icon["url"], Kind.ACTOR_ICON)
+        if activity.type == ap.ActivityType.CREATE.value:
+            for attachment in activity.get_object()._data.get("attachment", []):
+                MEDIA_CACHE.cache(attachment["url"], Kind.ATTACHMENT)
+
     @ensure_it_is_me
     def outbox_new(self, as_actor: ap.Person, activity: ap.BaseActivity) -> None:
         self.save(Box.OUTBOX, activity)