Fangtooth Instances ISO upload issue

I found the issue: Instances | TrueNAS Documentation Hub

Image Filename Requirements
Valid instance names must meet the following conditions:

  • The name must be between 1 and 63 characters long.
  • The name must contain only letters, numbers and dashes from the ASCII table.
  • The name must not start with a digit or a dash.
  • The name must not end with a dash.