По запросу: "add files to a folder" найдено 144 иконки.

folder-merge-solid
ic_fluent_remove_recent_24_filled Created with Sketch.
file_type_zip
Folder-add Created with Sketch.
ic_fluent_folder_move_48_regular Created with Sketch.
folder Created with Sketch Beta.
expand
received-inbox
folder__plus_fill [#1788] Created with Sketch.
alt-folder
Instagram icon
plesk
firefoxbrowser
https://www.svgrepo.com/show/474929/opened-folder.svg
document-folder Created with Sketch.
]>
plugin-line