NextCloud + Collabora cannot read document files from external storage

Hi All,

I have installed NextCloud 10.0.1 and integrated Collabora Office on two separate machine successful, after that I can upload and read, edit docx, xlsx files normally. However today, when I configured local external storage, type local (actually it is filesystem mounted from within nextcloud machine),all user from ldap domain cannot read, edit any word, excel documents if they are uploaded to folder that is on external storage. In additional, one strange thing here is that account ncadmin still can, edit them successfully, though sometime their content is empty and return full content when i refresh again. Please help me resolve problem! So sorry for my weak speak english.

I attach the error message here: