You can upload the video from My Media on the left panel.
Step 1: Click My Media from the left panel and then click the upload button and choose a video file from your computer.
Step 2: Once the upload is complete, you can click on the video thumbnail to add it to the timeline.
Q) Is there a limit to the number of videos that I can add to the timeline?
A. No. There is no limit to the number of videos you want to upload on the timeline. However, there are few limitations with regard to the size and the duration of the clips that you upload:
The file size of the video clip should not exceed 1GB
The duration of the video should not exceed 60min.
Q) Can I add a video as an overlay on another video?
A. We currently do not have the option to add video as an overlay. However, we do support image overlays. You can learn more about adding image overlays here.
Q) Whenever I add a video clip, it gets placed at the end of the timeline. How can I reposition clips along the timeline?
A. All media clips uploaded to the timeline are placed at the end by default. Here's how you can rearrange video clips along the timeline -
Reduce the Zoom UI feature to view all video clips in the entire timeline
Select the clip you want to reposition and drag it across the timeline to where you'd like it to appear.