To add music to a TikTok slideshow, either pick a trending sound in the TikTok editor before you post, or — for public posts published through a tool like Slidr — let auto-add music apply a track for you. Choosing the sound yourself gives you control over trend-fit; auto-music is faster when you're posting at volume.
Option 1: pick a trending sound in TikTok
Upload your slides, tap to add a sound, and browse TikTok's trending audio. Choosing the track yourself is the best way to match a sound that's performing right now, which helps reach. This works for both manual posts and slideshows you've sent to your TikTok drafts.
Option 2: auto-add music on public posts
When you publish a scheduled public postthrough Slidr, music can be added automatically at publish time — useful when you're posting a batch and don't want to touch each one. Drafts skip this so you can choose the sound by hand before publishing.
Which should you use?
Hand-pick the sound when trend-fit matters most (most growth content). Use auto-music when speed and consistency matter more than matching a specific track. Either way, don't post silent — missing audio is a common reason slideshows underperform.