Step 2 - uploading assets

After selecting files and clicking "open", the assets start uploading automatically:

• show bulk upload progress (we may not be able to show realistic progress so show a representation of an "in progress" without specific info about the progress)

Section of list of uploading files:

• icon for status (uploading, uploaded, waiting for upload)
• show metadata of each file
• option to "add bulk metadata" inactive
• option to edit and add metadata to individual files (already uploaded or uploading only)
• link of each file to its place on webUI