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R renderPlotly has white background

I am new in R . This moment I am going to draw some visualization using ggplot2 (Everything is done). My visualization has an image as a background. When I am going to use renderPlotly on the server and plotlyOutput in UI, but background is always white. If I use renderPlot on the server and plotOutput in UI, it works fine.

I really need to use renderPlotly . Also, I tried to use ggplotly . ggplotly(ggplot2_object) but background is still white.

Any ideas ?

I also write same post on stackoverflow, but no answers at all.

Thanks !