Hello @CharlesD67 ,
We're sorry to hear you've run into some issues while uploading contacts. Does this only happen when trying to add a single contact? Or does it occur in the Import via File and Type/Paste Multiple options as well? Would you also be able to provide a screenshot of the screen for our troubleshooting records?
In the meantime, an alternative method could be using the Type/Paste Multiple method (if available), and then going back to the contact after its creation to edit in the rest of the info needed.