Missing Hot Cue in the playlists

I have a Prime4 I imported the rekordbox playlist to Engine Prime then I copied them to the usb drive pen and to the SSD HD too, and all was fine ( I mean songs, orders and hotcues) Today I created a playlist with Engine Prime, I set up hotcues, then I copied the playlist to the SSD HD , and all was fine but Hotcues are missing. To copy the playlists, in both cases, I just drag & drop. Do I miss something? Thanks