I can create file but cannot save or edit file on collabora

My collabora app cannot save or edit file, Please look detail on https://youtu.be/mFbpVHYhQwE

I tried

  • reboot
  • update collabora
  • reinstall collabora app

I checked

  • disk space is ok
  • error log is no error

I information

  • Nextcloud v. 20.0.5
  • Collabora Online - Built-in CODE Server 6.4.1004
  • Collabora Online 3.8.4
  • OS Ubuntu 20.04.1 LTS

Anyone know how help me please.

Best regards,
Wannachai J.