Subtitle tracks have a strict text-entry protection mechanism to prevent non-text media from mixing in and disrupting the timeline structure, but they support lossless conversion and degradation at any time.
[Operation] ① Recognize entry limits: Subtitle tracks only allow STT-generated subtitles, externally imported subtitles, and manually added text/titles/word art. Dragging in video, audio, stickers, or effects will trigger a warning stating "Current track is a subtitle track, only supports text materials"; ② Convert to normal track: Click the "Close Subtitle Track (Convert to Video Track)" button on the left side of the track header. The track will instantly revert to a normal video track without requiring confirmation, and material entry restrictions will be immediately lifted; ③ Re-upgrade: If you need to re-enable subtitle linkage later, click "Open Subtitle Track" on the left side of the track header to reapply the entry and linkage logic.
[Verification] After closing the subtitle track, stickers and PiP media can be smoothly dragged into the track and edited freely. Once reopened, the system restores the text-exclusive management state.
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