Step 1: 
Go to Products  > Shopee, you can upload videos for Shopee draft or active products on BigSeller. Then click the edit button.




Step 2:
Click Add Video to upload the video from yoru computer. 




Note:

• The video max 30MB, resolution can't exceed 1280 x 1280px.
• The duration should be 10s - 60s.
• Only supports MP4 format.
• Please publish the products within 7 days after uploading the videos, otherwise the video will be deleted automatically.