Of course the recommendation would be to stop using SMB1 and switch to smb2 or 3
The issue is that some old NAS devices do not have that capability of using other versions of smb
See this post UNC Path not working following update to 1.32.0.6918 - #25 by anon18523487
and if you are using a NAS for the media - see what settings it has for SMB
