Android file application: the SMB share appears but

My SMB server (which runs on a raspberry pi with SAMBA as server software, configuration according to this guide) is usually displayed in the built-in Android file manager (under the heading "Network Neighborhood"). Oddly enough, although several Android applications (AndSMB, Solid Explorer) and my Linux box connect without problems, the native application "Files" produces this error when I connect to a folder (for example, public) in the share : "The operation failed, I do not have access rights to the folder". Before I can select a folder that I want to open, however, it says "Connected correctly", but it fails with the mentioned error after selecting a folder.

I tried to make the relevant actions recordable and more permissible through editing /etc/samba/smb.conf, but so far without luck. Other devices continue to connect well, even with some more specific configurations. Does anyone know how to make the Andriod and Samba file application work together? What kind of configurations / types of shared resources would the "Files" application expect?

Some potentially relevant portions of /etc/samba/smb.conf on my server, the editions are of basic records (like the minimum server protocol) + the linked guide above, and the rest are simply default values, I think:

[global]



Minimum server protocol = NT1
...
[public]
comment = public storage
route = / my / route /
valid users = @users
force group = users
public = yes
can you write = yes
navigable = yes
read only = no
create mask = 0660
Directory mask = 0771