With save_to = mp4 file (chosen or by the RAM guard) the join writes the video and comparison itself, without the prompt / workflow tags Save Video adds, so the files could not be dropped back into ComfyUI. They now carry the same tags (JSON, use_metadata_tags), passed through an ffmetadata file so large workflows fit. Bump BFSNodes version to 1.105.4. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>