Improve UI to upload multiple files

This is a pure usability bug, not a technical bug - still a bug

User story: I, as a user want to upload a new file in a document

As a dumb user here is what I will do

• go in a workspace
• go under the "Files" tab
• click on the "+Add" button
• select my file on my HD using the modal window
• see an upload progress bar (so start to think the file is being uploaded)
• when progress bar is done, see a "Done" message
• think my file has been added

As a dumb user I will think the button at the bottom called "Add new files", I will think it is there to add new files ... (while wondering about the difference with the "+Add button on top".
I will go back to the main tab and will see no file uploaded.

It happens the "Add new files" is a sort of commit for the system to validate the previously uploaded file are to be stored. Right ?

Possible solution "Add new files" should be renamed in "Store the selected and uploaded files".