returning email won't let me type

We called apple support and Dallas was able to show us how to fix it. The email that we were trying to reply to had some graphics package. The fix was to go to Settings > Privacy and Security > Others > Extensions.

We turned off Markup in Actions and Photo Editing. That fixed the problem.

Dallas at Apple Support was extremely helpful!!

To clarify: When I try to forward an email, and I begin to type into the body of the reply: I can type alphanumeric characters, but not a space typed from the space bar.

When I do that, the email goes into some sort of edit mode. A rectangle appears in the body of the original email and I get a prompt that says Markup, More, Remove Background with associated icons.

I have done several Restarts and the problem does not go away.

Has anyone ever seen this?

Thanks!