It is possible to select only an excerpt of the video media that you wish to use.
Once the video media is added to your screen:
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Click on the Edit button "✏️", which appears on the media field hover:
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In the Cut tab, choose the part of your video that you want to keep. Use the player sliders located under the preview.
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Don't forget to save.
The trim duration that appears on the right under the player corresponds to the total duration after trimming your media.