Save and open_with icons by Cole Bemis (http://colebemis.com) / CC 3.0 Unported

Source: 
save: https://www.iconfinder.com/icons/227583/in_icon#size=128
open_with: https://www.iconfinder.com/icons/227574/open_icon#size=128

Full icon set Feather: https://www.iconfinder.com/iconsets/feather


Attachment icon by Designmodo (http://designmodo.com) / CC 3.0 Unported

Source:
attachment: https://www.iconfinder.com/icons/115756/attachment_clip_paper_icon#size=128

Full icon set Linecons Free - Vector Icons Pack: https://www.iconfinder.com/iconsets/linecons-free-vector-icons-pack
