import .json files - upload here link

**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.