diff --git a/lib/private/FilesMetadata/FilesMetadataManager.php b/lib/private/FilesMetadata/FilesMetadataManager.php
index 013c85af604b6..9bfa8ae49d6da 100644
--- a/lib/private/FilesMetadata/FilesMetadataManager.php
+++ b/lib/private/FilesMetadata/FilesMetadataManager.php
@@ -176,7 +176,8 @@ public function saveMetadata(IFilesMetadata $filesMetadata): void {
 
 		$json = json_encode($filesMetadata->jsonSerialize());
 		if (strlen($json) > self::JSON_MAXSIZE) {
-			throw new FilesMetadataException('json cannot exceed ' . self::JSON_MAXSIZE . ' characters long');
+			$this->logger->debug('huge metadata content detected: ' . $json);
+			throw new FilesMetadataException('json cannot exceed ' . self::JSON_MAXSIZE . ' characters long; fileId: ' . $filesMetadata->getFileId() . '; size: ' . strlen($json));
 		}
 
 		try {