I’m have trouble loading the video in the custom asset editor.
I thing there should be a texture offset to fix the incorrect sizing it will make things easer, unless there’s another easier thing I don’t know about.
Please see screenshots
Use Revit material editor. Get the orientation and size correct using an image. Then swap out for the animated texture.
My best practices recommendation for setting the origin of an image is to use a Model Pattern that’s the same size as the image. When you set the origin of the model pattern the image adjusts accordingly.
https://www.linkedin.com/pulse/graphics-signage-set-dressing-entourage-revit-enscape-phil-read/