По запросу: "Добавить расширение файла" найдено 144 иконки.

plus-folder
file_share2_line
received-inbox
copy-file-solid
file-text
clipboard
expand
expand-horizontal
expand Created with Sketch Beta.
plus-circle Created with Sketch Beta.
add
cloud Created with Sketch Beta.
generate-pdf
clipboard-line
dropbox
swap-vertical
add-square