How to make a webdav share merged with mhdds available to all users in the system?

Question

linux

Comrades, I'm looking for help.
In terms of self-development, I tried to make myself a ball for its subsequent use with nginx.
Did according to the instructions from this blog.
As a result, now nginx does not see files from the merged shares.
The newly added user cannot see these shares either.
That is, we can say that only root can communicate with it.
Tell me how to fix and make this point available to other users in the system?

Answer 1

What do they write in the logs?