Video: MP4, MOV, M4V, MKV
Images: PNG, JPG, JPEG, WEBP, BMP (single images are auto-compressed to cache if over ~10MB)
Audio: MP3, WAV, AAC, FLAC, M4A
Documents: PDF (treated as PPT layer with page flip; one PDF per scene)
PPT/PPTX are not supported and require a separate plugin.