DB Scan for Network Folder doesn’t work!

I use a synology NAS where my music is stored. With Roon everything works fine. But DB Scan in Rose Connect App on added Network Folder does nothing. Play music via Rose Connect App directly navigated to the Network Folder works, music is played without issues.

Can anybody help?

Did the scan actually complete? It takes Rose quite some time to do that.

I found the problem. The manual add of the network share works visually, but no scan. With the Add/Del function it looks the same (except / at end), but DB scan is starting.