diff --git a/src/structures/Message.js b/src/structures/Message.js
index 960ff87..da63b87 100644
--- a/src/structures/Message.js
+++ b/src/structures/Message.js
@@ -17,6 +17,13 @@ class Message extends Base {
     }
 
     _patch(data) {
+        /**
+         * MediaKey that represents the sticker 'ID'
+         * @type {string}
+         */
+        this.mediaKey = data.mediaKey;
+
+
         /**
          * ID that represents the message
          * @type {object}
diff --git a/src/util/Injected.js b/src/util/Injected.js
index dbf523a..0367db1 100644
--- a/src/util/Injected.js
+++ b/src/util/Injected.js
@@ -123,7 +123,7 @@ exports.LoadUtils = () => {
         mediaObject.consolidate(mediaData.toJSON());
         mediaData.mediaBlob.autorelease();
 
-        const uploadedMedia = await window.Store.MediaUpload.uploadMedia(mediaData.mimetype, mediaObject, mediaType);
+        const uploadedMedia = await window.Store.MediaUpload.uploadMedia({ mimetype: mediaData.mimetype, mediaObject, mediaType });
         if (!uploadedMedia) {
             throw new Error('upload failed: media entry was not created');
         }