diff --git a/Classes/Common/AbstractDocument.php b/Classes/Common/AbstractDocument.php
index 42901fc8e1..dd648466f3 100644
--- a/Classes/Common/AbstractDocument.php
+++ b/Classes/Common/AbstractDocument.php
@@ -320,6 +320,21 @@ abstract public function getFileInfo($id): ?array;
      */
     abstract public function getFileLocation(string $id): string;
 
+    /**
+     * This gets the location of a file representing a physical page or track
+     *
+     * @access public
+     *
+     * @abstract
+     *
+     * @param string $id The "@ID" attribute of the file node (METS) or the "@id" property of the IIIF resource
+     *
+     * @param string $fileGrp The "@USE" attribute of the file node (METS)
+     *
+     * @return string The file's location as URL
+     */
+    abstract public function getFileLocationInFilegroup(string $id, string $fileGrp): string;
+
     /**
      * This gets the MIME type of a file representing a physical page or track
      *
diff --git a/Classes/Common/MetsDocument.php b/Classes/Common/MetsDocument.php
index 4d099fa88b..9464a7e662 100644
--- a/Classes/Common/MetsDocument.php
+++ b/Classes/Common/MetsDocument.php
@@ -245,6 +245,23 @@ public function getFileLocation(string $id): string
         }
     }
 
+    /**
+     * @see AbstractDocument::getFileLocationInFilegroup()
+     */
+    public function getFileLocationInFilegroup(string $id, string $fileGrp): string
+    {
+        $location = $this->mets->xpath('./mets:fileSec/mets:fileGrp[@USE="' . $fileGrp . '"]/mets:file[@ID="' . $id . '"]/mets:FLocat[@LOCTYPE="URL"]');
+        if (
+            !empty($id)
+            && !empty($location)
+        ) {
+            return (string) $location[0]->attributes('http://www.w3.org/1999/xlink')->href;
+        } else {
+            $this->logger->warning('There is no file node with @ID "' . $id . '"');
+            return '';
+        }
+    }
+
     /**
      * @see AbstractDocument::getFileMimeType()
      */
diff --git a/Classes/Controller/PageGridController.php b/Classes/Controller/PageGridController.php
index 8346a26f4d..2272236b21 100644
--- a/Classes/Controller/PageGridController.php
+++ b/Classes/Controller/PageGridController.php
@@ -106,7 +106,7 @@ protected function getEntry(int $number, string $fileGrpThumbs): array
             if (array_intersect($fileGrpsThumb, array_keys($this->document->getCurrentDocument()->physicalStructureInfo[$this->document->getCurrentDocument()->physicalStructure[$number]]['files'])) !== []) {
                 while ($fileGrpThumb = array_shift($fileGrpsThumb)) {
                     if (!empty($this->document->getCurrentDocument()->physicalStructureInfo[$this->document->getCurrentDocument()->physicalStructure[$number]]['files'][$fileGrpThumb])) {
-                        $entry['thumbnail'] = $this->document->getCurrentDocument()->getFileLocation($this->document->getCurrentDocument()->physicalStructureInfo[$this->document->getCurrentDocument()->physicalStructure[$number]]['files'][$fileGrpThumb]);
+                        $entry['thumbnail'] = $this->document->getCurrentDocument()->getFileLocationInFilegroup($this->document->getCurrentDocument()->physicalStructureInfo[$this->document->getCurrentDocument()->physicalStructure[$number]]['files'][$fileGrpThumb], $fileGrpThumb);
                         break;
                     }
                 }