shiny using selectizeinput with images

Question

I'm using this link from the author of shinywidgets selectizeInput with image/icon to create a selectizeinput in shiny with images (already in the www folder), works well in local but images don't show on shiny server, I get no error, just images don´t show, only a blank square and the label.

Here is the code:

output$ui.menu.mosaicos <- renderUI({
      
    #Could you use an action button, and set the style='background-img:path/to/img;'
    
      #imagenes por cargar (mosaico - mosNOMBRE.png)
      mosData <<- data.frame("mosaico" = list.files("www/", "mos[A-Z0-9]",
                                                 all.files = FALSE,
                                                 full.names = TRUE))%>%
      mutate("nombres" = str_extract(mosaico,"[A-Z0-9].+\\.")%>%gsub("\\.", "", .),
             "picker" = gsub("www/","", mosaico))
      
      filling <- mosData%>%pivot_wider(-mosaico,names_from = nombres,values_from = picker)
    
      selectizeInput(inputId = "pickMosaico",  
                            label = "Mosaicos",
                            width = "200px",
                            choices = filling,
                            options = list(
                              render = I(
                                "{
      option: function(item, escape) {
      return '<div><img src=\"' + item.value + '\" width = 160 />' + escape(item.label) + '</div>'
      }
      }"))
      )
  })