Directory problem

Hi experts, I have the following directory problems, please help me.

  1. my nextcloud web app and mobile app can’t create third level directory. But I can create first and second level directory.
  2. In the web, I also can’t upload file in third level directory.
  3. In the mobile app, I can upload files.

Finally, I find one way to create third directory from my finder because i can find my nextcloud folder there and create third level directory.

And before, i can use nextcloud smoothly, but after i install new freeness version 11.2-U5, then it has this problem. Before, the freeness version is 11.2-U2.

Solved: Setting permissions recursively will solve this issue.