ONE Admin > Programme Management > Series > Find the Programme > Actions > Manage Series Videos

Here you will see a list of your series. Under 'Actions', you can 'Manage Season Videos'

Select '+ New Video' in the top right corner and enter your video information
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Your video can be assigned to seasons and episodes that have been created in the system and you have the ability to name your video ie 'Promo'. 

Once all information is entered you can choose to make your video public, restricted and downloadable before saving. 

Below is how a public video will appear under the selected series