This improvement is (part of) the second use case that we want to cover with the "Bulk actions for multiple assets" epic MGNLDAM-1007

As an author, I want to be able select multiple assets at the same time so to download them in just one click 

[ On Productboard ]

AC

From the Assets App:

• Select multiple assets at the same time,
  • Download multiple assets within the same folder
    • files will be zipped without any folder structure, the name of the zip file will be enough
  • Download multiple assets in different folders
    • Keep the folder's structure (up until there is a common folder for the child items)
  • Download folders, and their sub-items (NEED VALIDATION)
• Download item action allows me to download multiple assets at the same time
  • The download action will create a ZIP file containing the selected assets
• Notify the user when long-running processing is running
  • not in detail, just notify the user when the process starts and when it ends CURRENT SOLUTION DOES NOT WORK
  • progress bar is out of scope VISUAL FEEDBACK IS NEEDED
• Create another action 'Download assets' and replace the old 'Download asset' action, when multiple files are selected
• Create a dialog with, 'zip filename' and 'Download to' fields that will include `Download all` and `Cancel` buttons
  • users can already choose the target destination using the native browser capabilities
  • the Multiple download action can be configured with a custom archive name 
  • VISUAL FEEDBACK IS NEEDED so this item will be covered in a followup

Desired behavior in case of duplicated file name: 

Dev notes

• the processing (not the downloading) could block the UI. Please ensure that User experience is not affected
• External DAM not in scope but enable support for extending the bulk download for it.

Out of Scope

• Download action not in the Assets Chooser
• Not for external dam
• Folders behaviour does not change (due to other actions being associated with folder selection)