I had to poke around a whole lot for this and want to share a quick how to in case others are stuck with this issue. Currently, on the free plan, you can upload files to the workspace, but once they are uploaded there’s a very cumbersome set of steps to go through to delete them and no way of navigating through to the right place via the UI in the app or web version.
So here are the steps:
1.) Go directly to https://web.postman.co/billing/add-ons/overview
2.) Under Resource Usage > Other resources, scroll down to Test Data Retrieval Count
3.) Click the View detailed usage link that appears next to Test Data Retrieval Count.
Note: that link has it’s own direct URL (https://web.postman.co/usage/test-data), but a direct use of that link just takes you to https://web.postman.co/billing/add-ons/overview) hence the need to follow the steps above.
The app should make it easy and intuitive to remove these files or at LEAST take you directly to that page! Seriously!
Hope this helps other users out there at least.