diff --git a/lib/Brightcove/API/CMS.php b/lib/Brightcove/API/CMS.php
index 8a580d7..6f3ae94 100644
--- a/lib/Brightcove/API/CMS.php
+++ b/lib/Brightcove/API/CMS.php
@@ -6,6 +6,8 @@
 use Brightcove\Object\Video\Video;
 use Brightcove\Object\Video\Source;
 use Brightcove\Object\Video\Images;
+use Brightcove\Object\Video\Poster;
+use Brightcove\Object\Video\Thumbnail;
 use Brightcove\Object\Playlist;
 use Brightcove\Object\CustomFields;
 
@@ -114,6 +116,76 @@ public function deleteVideo($video_id) {
     return $this->cmsRequest('DELETE', "/videos/{$video_id}", NULL);
   }
 
+  /**
+   * Gets the data for a single poster by issuing a GET request.
+   *
+   * @return Video $video
+   */
+  public function getPoster($video_id) {
+    return $this->cmsRequest('GET', "/videos/{$video_id}/assets/poster", Poster::class);
+  }
+
+  /**
+   * Creates a new poster object.
+   *
+   * @return Poster $poster
+   */
+  public function createPoster($video_id, Poster $poster) {
+    return $this->cmsRequest('POST', "/videos/{$video_id}/assets/poster", Poster::class, FALSE, $poster);
+  }
+
+  /**
+   * Updates a poster object with an HTTP PATCH request.
+   *
+   * @return Poster $poster
+   */
+  public function updatePoster($video_id, Poster $poster) {
+    $poster->fieldUnchanged('id');
+    return $this->cmsRequest('PATCH', "/videos/{$video_id}/assets/poster/{$poster->getId()}", Poster::class, FALSE, $poster);
+  }
+
+  /**
+   * Deletes a poster object.
+   */
+  public function deletePoster($video_id, $poster_id) {
+    return $this->cmsRequest('DELETE', "/videos/{$video_id}/assets/poster/{$poster_id}", NULL);
+  }
+
+  /**
+   * Gets the data for a single thumbnail by issuing a GET request.
+   *
+   * @return Video $video
+   */
+  public function getThumbnail($video_id) {
+    return $this->cmsRequest('GET', "/videos/{$video_id}/assets/thumbnail", Thumbnail::class);
+  }
+
+  /**
+   * Creates a new thumbnail object.
+   *
+   * @return Poster $thumbnail
+   */
+  public function createThumbnail($video_id, Thumbnail $thumbnail) {
+    return $this->cmsRequest('POST', "/videos/{$video_id}/assets/thumbnail", Thumbnail::class, FALSE, $thumbnail);
+  }
+
+  /**
+   * Updates a thumbnail object with an HTTP PATCH request.
+   *
+   * @return Poster $thumbnail
+   */
+  public function updateThumbnail($video_id, Thumbnail $thumbnail) {
+    $poster->fieldUnchanged('id');
+    return $this->cmsRequest('PATCH', "/videos/{$video_id}/assets/thumbnail/{$thumbnail->getId()}", Thumbnail::class, FALSE, $thumbnail);
+  }
+
+  /**
+   * Deletes a thumbnail object.
+   */
+  public function deleteThumbnail($video_id, $thumbnail_id) {
+    return $this->cmsRequest('DELETE', "/videos/{$video_id}/assets/thumbnail/{$thumbnail_id}", NULL);
+  }
+
   /**
    * @return int
    */
diff --git a/lib/Brightcove/Object/ObjectBase.php b/lib/Brightcove/Object/ObjectBase.php
index 45dc526..cb05589 100644
--- a/lib/Brightcove/Object/ObjectBase.php
+++ b/lib/Brightcove/Object/ObjectBase.php
@@ -56,7 +56,7 @@ protected function canonicalFieldName($name) {
   public function postJSON() {
     $data = [];
     foreach ($this as $field => $val) {
-      if ($field === 'changedFields' || $field === 'fieldAliases' || $val === NULL) {
+      if ($field === 'changedFields' || $field === 'fieldAliases') {
         continue;
       }
       $field = $this->canonicalFieldName($field);
@@ -84,9 +84,6 @@ public function patchJSON() {
     $data = [];
     foreach ($this->changedFields as $field) {
       $val = $this->{$field};
-      if ($val === NULL) {
-        continue;
-      }
 
       $field = $this->canonicalFieldName($field);
 
diff --git a/lib/Brightcove/Object/Video/Poster.php b/lib/Brightcove/Object/Video/Poster.php
new file mode 100644
index 0000000..bdaf70b
--- /dev/null
+++ b/lib/Brightcove/Object/Video/Poster.php
@@ -0,0 +1,53 @@
+<?php
+
+namespace Brightcove\Object\Video;
+
+use Brightcove\Object\ObjectBase;
+
+/**
+ * Poster image
+ */
+class Poster extends ObjectBase {
+  protected $id;
+  protected $remote_url;
+
+  public function applyJSON(array $json) {
+    parent::applyJSON($json);
+    $this->applyProperty($json, 'id');
+    $this->applyProperty($json, 'remote_url');
+  }
+
+  /**
+   * @return string
+   */
+  public function getId() {
+    return $this->id;
+  }
+
+  /**
+   * @param string $id
+   * @return $this
+   */
+  public function setId($id) {
+    $this->id = $id;
+    $this->fieldChanged('id');
+    return $this;
+  }
+
+  /**
+   * @return string
+   */
+  public function getRemoteUrl() {
+    return $this->remote_url;
+  }
+
+  /**
+   * @param string $remote_url
+   * @return $this
+   */
+  public function setRemoteUrl($remote_url) {
+    $this->remote_url = $remote_url;
+    $this->fieldChanged('remote_url');
+    return $this;
+  }
+}
\ No newline at end of file
diff --git a/lib/Brightcove/Object/Video/Thumbnail.php b/lib/Brightcove/Object/Video/Thumbnail.php
new file mode 100644
index 0000000..03f3935
--- /dev/null
+++ b/lib/Brightcove/Object/Video/Thumbnail.php
@@ -0,0 +1,53 @@
+<?php
+
+namespace Brightcove\Object\Video;
+
+use Brightcove\Object\ObjectBase;
+
+/**
+ * Thumbnail image
+ */
+class Thumbnail extends ObjectBase {
+  protected $id;
+  protected $remote_url;
+
+  public function applyJSON(array $json) {
+    parent::applyJSON($json);
+    $this->applyProperty($json, 'id');
+    $this->applyProperty($json, 'remote_url');
+  }
+
+  /**
+   * @return string
+   */
+  public function getId() {
+    return $this->id;
+  }
+
+  /**
+   * @param string $id
+   * @return $this
+   */
+  public function setId($id) {
+    $this->id = $id;
+    $this->fieldChanged('id');
+    return $this;
+  }
+
+  /**
+   * @return string
+   */
+  public function getRemoteUrl() {
+    return $this->remote_url;
+  }
+
+  /**
+   * @param string $remote_url
+   * @return $this
+   */
+  public function setRemoteUrl($remote_url) {
+    $this->remote_url = $remote_url;
+    $this->fieldChanged('remote_url');
+    return $this;
+  }
+}
\ No newline at end of file