How to know when files are added finished

I learn React and I have a custom GUI to show the files that user is adding using Uppy dashboard. When user e.g use select files from Google Drive or local files and adding them to the Dashboard view.

I need to know when all files are added. I try the file-added or files-added but this firers before thumbnail:generated firers so the “file” is missing the Blob then.

Is there some even or can you add some event for this so I can do the getAllFiles and sending them to my Custom Gui?

Can someone point me in the right way?