Plotly R: save an image as svg or tiff

I would like to save my plot as .svg or .tiff but as much as I have tried to save it checking several questions, I have not succeeded. The plot is a 3D surface and here is the code.

EjeX <- Table$Col1
EjeY <- Table$Col2
EjeZ <- as.matrix(Conc)
Fig1 <- plot_ly(
  x = EjeY, 
  y = EjeX, 
  z = EjeZ
  ) %>% add_surface(
  contours = list(
    z = list(
      show=TRUE,
      usecolormap=TRUE,
      highlightcolor="#ff0000",
      project=list(z=TRUE)
    )
  )
)
Fig1
layout(
  Fig1, scene = list(
    xaxis = list(
      title = "x", 
      range = c(5,15)
      ), 
    yaxis = list(
      title = "y", 
      range = c(100,160)
      ), 
    zaxis = list(
      title = "z", 
      range = c(0,14)
      )
    )
  )

Thank you so much in advance!