Koast now supports importing creatives directly from your Dropbox account. To get started, go to Settings > Integrations > Dropbox and click on the "Connect to Dropbox" button.
Sign in with the Dropbox account you’d like to import from. On the next two prompts, click Continue and Allow:
That's it! You will see the notification that Dropbox is now connected, and you can open the file picker:
You can import individual creatives or entire folders (including their subfolders) into Koast. Keep in mind that the import time will vary depending on the size of the selected data.