diff --git a/Classes/GcsStorage.php b/Classes/GcsStorage.php
index 56598b3..a5be694 100644
--- a/Classes/GcsStorage.php
+++ b/Classes/GcsStorage.php
@@ -237,6 +237,14 @@ public function importResourceFromContent($content, $collectionName): Persistent
         $resource->setSha1($sha1Hash);
         $resource->setMd5($md5Hash);
 
+        if (
+            class_exists('\finfo')
+            && ($finfo = new \finfo(FILEINFO_MIME_TYPE))
+            && ($mediaType = $finfo->buffer($content))
+        ) {
+            $resource->setMediaType($mediaType);
+        }
+
         $this->getCurrentBucket()->upload($content, [
             'name' => $this->keyPrefix . $sha1Hash,
             'metadata' => [
@@ -429,6 +437,13 @@ protected function importTemporaryFile(string $temporaryPathAndFilename, string
         $resource->setSha1($sha1Hash);
         $resource->setMd5($md5Hash);
 
+        if (
+            function_exists('mime_content_type')
+            && $mediaType = mime_content_type($temporaryPathAndFilename)
+        ) {
+            $resource->setMediaType($mediaType);
+        }
+
         $bucket = $this->getCurrentBucket();
         if (!$bucket->object($this->keyPrefix . $sha1Hash)->exists()) {
             try {
diff --git a/composer.json b/composer.json
index 59df614..1e9aff0 100644
--- a/composer.json
+++ b/composer.json
@@ -21,6 +21,9 @@
         "ext-pdo": "*",
         "ext-zlib": "*"
     },
+    "suggest": {
+        "ext-fileinfo": "Needed to set correct MediaType in storage"
+    },
     "autoload": {
         "psr-4": {
             "Flownative\\Google\\CloudStorage\\": "Classes"