Nodetool refresh

refresh - Load newly placed SSTables to the system without restart

Add the files to the upload directory, by default it located under /var/lib/scylla/data/keyspace_name/table_name-UUID/upload

Execute the nodetool refresh command

nodetool refresh <my_keyspace> <my_table>

For example:

/var/lib/scylla/data/nba/player_stats-91cd2060f99d11e6a47/upload

nodetool refresh nba player_stats

Nodetool Reference