Hola @Santi98
please refer to How do I upload an image/GIF from my computer to a narrative in an analysis?
Currently there is no way to upload an Image or a GIF on a QuickSight dashboard. Rendering an Image via an URL is the only available option.
Hope it helps. I am marking this as, “Solution,” but let us know if this is not resolved. Thanks for posting your questions on the QuickSight Community Q&A Forum!