Unable to upload images to stacker app, its giving error as below

Currently the stacker app is connecting to Airtable. When we are trying to attach any files in the app its giving error as below:
Access to XMLHttpRequest at ‘https://upload.files.stackerhq.com/prefetch’ from origin ‘Our Business Domain’ has been blocked by CORS policy: Response to preflight request doesn’t pass access control check: No ‘Access-Control-Allow-Origin’ header is present on the requested resource.

With the screen as below:

How to solve this?

They are reporting it as fixed. Here is a link to the status page