TYPO3 Core

The problem is in typo3/sysext/core/Classes/Resource/Service/UserFileMountService.php on line 43

The $PA['row']['storage'] is an array and the uid is stored at postion 0.

$storageUid = (int)$PA['row']['storage']⁰;

 public function renderTceformsSelectDropdown(&$PA)
    {
        // If working for sys_filemounts table
        $storageUid = (int)$PA['row']['base'][0];
        if (!$storageUid) {
            // If working for sys_file_collection table
---
>>>         $storageUid = (int)$PA['row']['storage'][0];
---
        }
   ...
 

Only the folders of the first file storage are shown. Please fix.

Thanks Frank for your solution.