Sorry, Jim, I didn’t see these emails until this afternoon.
Yes the only way to enter returns in cells in Excel is to use option return (mac), alt return (Win), or paste them in. Typing looks like the GIF below. (You may have to copy the File to you machine and open it there to get it to play. Mine plays from the desktop but not in my email.
Anyway it was an attempt to answer your previous question. Upon entering multiple lines when you exit the cell the row expands to accommodate.