Guide

Upload

Edit screen > Slide Properties on the right > Narration > Type:Upload

You can upload pre-recorded MP3 files. Using the trim feature, you can cut the 'fade-in' section for each slide.

Trimming

Edit screen > Slide Properties on the right > Narration > Type:Upload > Trim

While checking the format of the uploaded audio file, you can set the regeneration interval for each slide or have it automatically generate gaps.