PMS doesn't see NAS mapped drive if NAS switched on later

PMS is running on my i7 pc, I have 2 Synology NASses holding media. When I switch on the NASses first, then my pc finds the mapped drives (linked using Synology Assistant),

but when I switch on the pc first, then I need manually to click in File explorer on the mapped drive letter in order to establish the connection.

Isn't there a way to have PMS find the mapped drive on the NAS automatically?