SMB + OS X El Capitan

Hi,
Just added smb share with external hard drive.
I see it over the network, can connect and copy files to smb share. But can’t see them after copy. They are visible in Webfig/Files with correct names and sizes, but invisible in Finder. So I cant download them from share.

RB952Ui
2,5 HDD connected direct to USB port and formatted to ext3 with mikrotik
OS X 10.11.6
File coping via Finder

Have a similar problem on OS X 11.1 (Big Sur), but I can’t even copy files and create directories on the share, but at the same time everything works perfectly on 2 other Windows computers connected to the same router. Does anybody find a solution for this?