Use Sync Manager in Rekordbox.

At the bottom of the Media Browser, the panel listing [Collection], [Playlists] and [Devices], and only while [EXPORT] is chosen in the upper-left mode selector. Nearly every report of a rekordbox sync manager not showing turns out to be PERFORMANCE mode, or a Media Browser that has been hidden. A rekordbox sync manager greyed out usually means no supported device is connected yet, so plug the drive in first, then open the window.

Four moves: choose [EXPORT] in the upper-left, click the Sync Manager icon under the Media Browser, tick [Synchronize playlists with a device] and check your playlists, then click the arrow beside [Device]. The window has looked much the same since version 6. If yours does not match the steps above, run [Help] > [rekordbox update manager], or reinstall from the rekordbox download page.

Three different things carry the word sync. Beat SYNC on the deck matches tempo and phase between players and never touches your library. Sync Manager mirrors playlists onto a USB stick or SD card, and only appears once you select EXPORT. There is also Cloud Library Sync, which keeps one library in step across your own devices through cloud storage. This page covers the middle one.

Work through the chain. The [Synchronize playlists with a device] box has to be ticked, the playlists themselves have to be checked, and the arrow beside [Device] has to be clicked. Automatic syncing only fires when you start rekordbox and then click the device in the tree view, so nothing happens if the app was already open. Most reports of a rekordbox sync manager not working are one of those three.

Three documented blockers. Tracks from streaming services cannot be exported to a USB storage device or SD memory card at all. Missing files stop an export: choose [Display All Missing Files] from the [File] menu, then use [Auto Relocate] in the [Missing File Manager] window. A drive rekordbox cannot write to, NTFS for example, looks a lot like rekordbox not loading tracks onto it. Start by relocating missing files.

Two routes. For a one-off, right-click a playlist in the tree view and choose [Export Playlist], which copies the audio and writes the device database. For a drive you reuse every week, Sync Manager is better: tick the playlists once, and every later sync brings that device level with your collection. Full walkthrough: export a playlist to USB.

Usually the wrong library format for the player. In rekordbox, Device Library Plus is the old name for what AlphaTheta now calls OneLibrary, and the CDJ-3000X only browses a stick that carries it. Convert the drive with [Convert from Device Library] and the playlists appear. If no player reads the stick at all, check the file system instead: FAT32 is the safe choice, and exFAT works on a short list of models.

Use the library backup, not a USB stick. On the old machine choose [File] > [Library] > [Backup Library], and answer yes when it offers to include your music files. On the new machine choose [Restore Library] and open the .zip or .edb file. A backup made on Mac restores on Windows and the other way round. See setting up a new laptop.

They export from their DJ app instead of dragging files in Finder or Explorer. The app copies the audio and writes a database beside it holding playlists, cue points, beatgrids and waveforms, which is what the player actually reads. Format the stick FAT32 first, keep one stick per gig, and carry a spare. More on that in prepare a USB for a gig.

No. Searches like rekordbox not responding Mac, rekordbox not opening Windows 11, rekordbox not opening Windows 10 or rekordbox 6 not opening are startup faults, and the fix lives in AlphaTheta's troubleshooting FAQ rather than in a rekordbox 6.8.6 download. Rekordbox not playing through speakers and rekordbox PC MASTER OUT not working are audio device settings, while rekordbox link not working means PRO DJ LINK over LAN. AlphaTheta runs rekordbox support through the Inquiries form on rekordbox.com, and publishes no rekordbox support phone number.