per this article from Synology:I performed the following:
1. For DSM 6.2 22259 and later, please enable Enable Windows network discovery to allow file access via SMB under Control Panel > File Services > Advanced > WS-Discovery.
2. Under Control Panel > File Services > SMB/AFP/NFS tab > SMB section > Advanced tab, "Enable SMB 2 Lease”
3. Refresh Windows Client Network cache: As the LMB is elected by all computers, there are chances that the NAS is NOT elected as the LMB even if "Enable Local Master Browser" is ticked. Try to "Turn off network discovery" on the Windows PC, save it, and then turn it on again via Network and Sharing Center > Change Advanced Sharing Settings to clear the Windows cache.
