По запросу: "Add file extension" найдено 144 иконки.

file-multiple-solid
https://www.svgrepo.com/show/474929/opened-folder.svg
dropbox
Folder Ubuntu Icon This is shape (source) for Clarity vector icon theme for gtk Folder Ubuntu Icon This is shape (source) for Clarity vector icon theme for gtk Jakub Jankiewicz Jakub Jankiewicz 2010 image/svg+xml
Clarity Icon This is shape (source) for Clarity vector icon theme for gtk Clarity Icon This is shape (source) for Clarity vector icon theme for gtk Jakub Jankiewicz Jakub Jankiewicz 2010 image/svg+xml
generate-pdf
file_type_pdf2
Extension
firefoxbrowser
firefox
phone_add_fill
Plesk icon
add-document-note
Add
Add user
ic_fluent_people_add_24_filled Created with Sketch.
cloud Created with Sketch Beta.
add
image/svg+xml
ic_fluent_phone_add_new_app_24_regular Created with Sketch.
dashboard-add
notification-add