Can't attach more than one file:

1. Create a new mail in SOGo Webmail
2. Add an attachement and it's ok
3. Add a second attachement and the attachement box with file name remains red

Can't attach file after removing an attachment.

1. Create a new mail in SOGo Webmail
2. Add an attachement
3. Remove the attachement
4. Add the same or any other attachement and the box remains red or grey with no link on file name

I have done tests on Firefox 51.0.1 + IE 11 and the problem recurrs always.
On Chrome sometimes work.