tmp <- tempfile(fileext = ".pptx")
doc <- officer::read_pptx()
doc <- officer::add_slide(doc, layout = "Title Slide", master = "Office Theme")
print(doc, target = tmp)
doc <- officer::read_pptx(tmp)
initialize_to_page(doc, NA) # append to end
initialize_to_page(doc, 1) # insert at page 1
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