FlowUploadImproved - Summer '23 Issue Uploading for Guest User

[sfscgjohnson]

Steps to reproduce the behavior:

1. Go to flow with fileuploadimproved component on Summer '23 instance
2. Click on Upload
3. Select File and click upload
4. See error: 168 KB filesname.jpg upload progress is 0% Can't upload filename.jpg.

Expected behaviour

File should be uploaded

Actual behaviour

Get Error Message seen above this is after Summer '23 was added to the org.