diff --git a/Classes/Controller/FlipbookController.php b/Classes/Controller/FlipbookController.php
index 7e17120..4381c5f 100755
--- a/Classes/Controller/FlipbookController.php
+++ b/Classes/Controller/FlipbookController.php
@@ -9,7 +9,6 @@
 use TYPO3\CMS\Core\Resource\ResourceFactory;
 use TYPO3\CMS\Core\Utility\GeneralUtility;
 use TYPO3\CMS\Extbase\Configuration\ConfigurationManagerInterface;
-use TYPO3\CMS\Extbase\Domain\Model\Folder;
 use TYPO3\CMS\Extbase\Mvc\Controller\ActionController;
 use TYPO3\CMS\Frontend\ContentObject\ContentObjectRenderer;
 
@@ -99,10 +98,14 @@ public function showAction() : ResponseInterface
             $bigImageFolder = $this->settings['folder'];
             /** @var ResourceFactory $factory */
             $factory = GeneralUtility::makeInstance(ResourceFactory::class);
-            /** @var Folder $folder */
             $folder = $factory->getFolderObjectFromCombinedIdentifier($bigImageFolder);
 
-            $this->view->assign('files', $folder->getFiles());
+            $files = $folder->getFiles();
+            $imageFiles = array_filter($files, function ($file) {
+                return in_array($file->getExtension(),['jpg','jpeg','png','gif','webp']);
+            });
+
+            $this->view->assign('files', $imageFiles);
 
         }
 
diff --git a/Classes/ViewHelpers/InlineJsViewHelper.php b/Classes/ViewHelpers/InlineJsViewHelper.php
index 1490703..062cd68 100755
--- a/Classes/ViewHelpers/InlineJsViewHelper.php
+++ b/Classes/ViewHelpers/InlineJsViewHelper.php
@@ -14,10 +14,6 @@
 
 
 /**
- *
- *
- * @package products
- * @license http://www.gnu.org/licenses/gpl.html GNU General Public License, version 3 or later
  *
  */
 class InlineJsViewHelper extends AbstractTagBasedViewHelper
@@ -86,11 +82,11 @@ public function render()
                 if (count($files) > 0) {
                     /** @var File $file */
                     foreach ($files as $file) {
-                        $content .= '{src:"' . $file->getPublicUrl() . '",';
+                        $content .= '{src:"' . $file->getPublicUrl() . '"';
                         if ($thumbfolder !== NULL) {
-                            $content .= 'thumb:"' . $thumbfolder->getPublicUrl() . $file->getName() . '",';
+                            $content .= ',thumb:"' . $thumbfolder->getPublicUrl() . $file->getName() . '"';
                             if ($file->getProperty('title')) {
-                                $content .= 'title: "' . $file->getProperty('title') . '"';
+                                $content .= ',title: "' . $file->getProperty('title') . '"';
                             }
                         } else {
                             $content .= '';
@@ -144,7 +140,7 @@ public function render()
     }
 
     /**
-     * @param integer|NULL $pageUid target PID
+     * @param int $pageUid target PID
      * @param array $additionalParams query parameters to be attached to the resulting URI
      * @param integer $pageType type of the target page. See typolink.parameter
      * @param boolean $noCache set this to disable caching for the target page. You should not need this.
@@ -154,10 +150,10 @@ public function render()
      * @param boolean $absolute If set, the URI of the rendered link is absolute
      * @param boolean $addQueryString If set, the current query parameters will be kept in the URI
      * @param array $argumentsToBeExcludedFromQueryString arguments to be removed from the URI. Only active if $addQueryString = TRUE
-     * @param string $addQueryStringMethod Set which parameters will be kept. Only active if $addQueryString = TRUE
+     * @param string|null $addQueryStringMethod Set which parameters will be kept. Only active if $addQueryString = TRUE
      * @return string Rendered page URI
      */
-    public function uriPage(int $pageUid, array $additionalParams = [], $pageType = 0, $noCache = FALSE, $noCacheHash = FALSE, $section = '', $linkAccessRestrictedPages = FALSE, $absolute = FALSE, $addQueryString = FALSE, array $argumentsToBeExcludedFromQueryString = array(), $addQueryStringMethod = NULL)
+    public function uriPage(int $pageUid, array $additionalParams = [], int $pageType = 0, bool $noCache = false, bool $noCacheHash = false, string $section = '', bool $linkAccessRestrictedPages = false, bool $absolute = false, bool $addQueryString = FALSE, array $argumentsToBeExcludedFromQueryString = [], string $addQueryStringMethod = NULL)
     {
 
         /** @var UriBuilder $uriBuilder */
diff --git a/Resources/Private/Templates/Flipbook/Show.html b/Resources/Private/Templates/Flipbook/Show.html
index 8673759..740163c 100755
--- a/Resources/Private/Templates/Flipbook/Show.html
+++ b/Resources/Private/Templates/Flipbook/Show.html
@@ -25,12 +25,15 @@ <h2>{settings.header}</h2>
                                 </figure>
                             </f:then>
                             <f:else>
-                                <figure>
-                                    <f:image image="{files.0}" id="container_{uid}" class="rflip-border img-fluid" maxWidth="{settings.previewMaxWidth}" height="{settings.previewMaxHeight}" alt=""/>
-                                    <f:if condition="{files.0.description}">
-                                        <figcaption>{files.0.description}</figcaption>
-                                    </f:if>
-                                </figure>
+                                <f:alias map="{file: '{files -> f:first()}'}">
+                                    <figure>
+                                        <f:image image="{file}" id="container_{uid}" class="rflip-border img-fluid" maxWidth="{settings.previewMaxWidth}" height="{settings.previewMaxHeight}" alt="{file.alternative}"/>
+                                        <f:if condition="{file.description}">
+                                            <figcaption>{file.description}</figcaption>
+                                        </f:if>
+                                    </figure>
+                                </f:alias>
+
                             </f:else>
 
                         </f:if>