import .json files - upload here link

[tgiffin]

Describe the bug.
This is not a bug -- its feedback by clicking on your feedback link in the widget UI

To Reproduce
Steps to reproduce the behavior:

1. click on the upload link
2. select a file from the dialog
3. only lets you select one file
4. Would be nice to multi-select and have each file become its own frame

Expected behavior
Expected to multi-select files and upload a group at a time vs. one at a time.

Additional context
otherwise, it's a nice tool - not a complaint just feedback for improvements.