Contacted Quicken telephone support. Talked with CSR Maria. What an angel. It took several minutes to work through the issues I had with transactions not being accepted or attachments not being accepted in the transactions register. The issue boiled down to a corrupted file and FILE MANAGEMENT. Even the backup file was corrupted. She was able to bring up and validate the main file which resolved my issue. My uninstall was NOT needed. Just needed to clean up and validate my backup file. She also instructed me on file management. DO NOT backup the MAIN file to ONE DRIVE. If you have ONE Drive taking automatic snapshot backups of the MAIN file and then One Drive is used to restore the MAIN file Quicken will fail. To my understanding you can use ONE DRIVE to back up a backup data file, just not the MAIN file.
The MAIN file has an icon with red background and a white 'Q'. The BACKUP file is an icon with a white background and a red 'Q'. The backup file can be backed up anywhere. To my understanding the MAIN file must remain in the user/,,,/ file on the desktop. I hope I got that right. Anyway, my issue was resolved. I appreciate the patience Angel exhibited. You are an asset to Quicken.