unable to place logo / image in Shiny App

问题

I'm trying my best to place a logo in my shiny app, but its showing blue question mark every time. I made a separate ui and server file as well but still didn't work. I also made a 'www' folder and set it as a working directly with image inside it, but no result. Can someone please guide me?

library(dplyr)

library(shiny)

library(shinythemes)

#UI
ui = fluidPage(img(src = "picture.jpg"), fluidRow( rpivotTableOutput("pivot")))


#Server
server = function(input, output, session) {reactive({
    mtcars %>% select(cyl, carb, vs, mpg) %>% group_by(carb,vs ) %>% summarise(mpg=sum(mpg))}) 

  output$pivot <- renderRpivotTable(  rpivotTable::rpivotTable(mtcars, rows = c( "vs"),cols=c("carb"), vals =  "mpg", aggregatorName = "Sum",                                rendererName =  "Table",                                                  width="50%", height="550px"))}

shinyApp(ui = ui, server = server) 

来源：https://stackoverflow.com/questions/53053598/unable-to-place-logo-image-in-shiny-app