Here's the step-by-step process for resolving the OK PDF attachment issue:

1. Navigate to the PDF attachment screen specific to the return type and delete the existing pdf file.
2. Exit the client, re-enter it, and attempt to re-attach the PDF.
3. If the problem persists, document the specific error details in the comments below.

Note: Some critical errors function as warnings that can't be cleared; yet they don't prevent you from successfully e-filing the return.