To add graphic to video use Figma template. Just duplicate file, change theme introduction, duplicate lower third titles. After this export frames as png files, and drag-and-drop them into a editor.

Opening title

Theme introduction

Lower third title

Place "overlay logo" over the all video except Opening and Closing Titles. Do not use any transition or animations (only some crossfade transition allowed if you need it). Put all graphics into the stack. Lower third titles need to be framed into cut scenes.

Closing title

Video project structure example