Uploading a file using Rselenium

I want to upload a file from my computer using Rselenium. Upload button pops up the folder on clicking. Don't know how to proceed.

ph_temp<- tempfile("Home_Page_Issues", fileext = ".png") snd_ph$sendKeysToElement(list("/Users/apple/Desktop/Screen Shot 2020-12-20 at 10.15.36 PM.png", key= "enter"))