Just type > before pasting the quoted text. But you have type some text in a separate line as a place holder of your own response before you paste your quote or else your response will be part of the quote as you just said.
In Slack I can type > to quote something, and a line break will continue the quote. However, pressing backspace returns to normal text
In Teams you're stuck on quote-mode
Notice that in Slack I don't need to use quotes for replies, as the reply-to-message works
Retraction as I write this after some intensive googling: apparently pushing shift+Enter twice in teama breaks you out of quote mode. So at least there's that.
In Slack I can type > to quote something, and a line break will continue the quote. However, pressing backspace returns to normal text
In Teams you're stuck on quote-mode
Notice that in Slack I don't need to use quotes for replies, as the reply-to-message works
Retraction as I write this after some intensive googling: apparently pushing shift+Enter twice in teama breaks you out of quote mode. So at least there's that.