Texture Library
The video textures in your database can be added to any timeline as texture clips. For quick access from within the Timelines editor, the libraries on the right-hand side include a Texture tab that lists all of the video textures in the open database.
From the Textures library 
you can load a texture as a clip by dragging and dropping from the library. Drop the clip on a Textures track.
Tip
Textures can also be dragged directly from the Matter sidebar's texture library.
When the timeline is played, the video will be animated simultaneously in all materials using it that are assigned to surfaces in the active viewport.