Samba write permissions for non-admins?

Question

linux

Tell me what to fix in the samba config so that all Windows 7 users have write permissions? Those users who work under the admin account can safely write to the folder, and those who work under the account of a simple user can only view the contents of folders and that's it.
[global]
workgroup = SVETOFOR
security = user
server string = %h server (Samba, Ubuntu)
map to guest = Bad User
[BackUP]
path = /home/srv/BackUP
writeable = yes
read only = no
guest ok = yes
guest only = yes
public = yes

Answer 1

Thanks to Yuri Chudnovsky for the tip. The problem was in the rights to the folder.
Solution:
# view the rights to the folder
ls -l /home/srv/BackUP
And then manually RMB on each problematic folder Properties - Rights - others - read and write.
The only thing I didn't understand was why users with "admin" did everything without any problems, while simple plugs.

Answer 2

Most likely you need to allow everyone to write to the folder:
sudo chmod +w /path/to/dir