Not sure what's happening with your quotes and replies.
I'm going to try to merge them so to make sense to myself.
What works on a computer is to highlight the sentence you want to quote by holding the mouse button down over all the text of interest. Release the mouse button and there will be two choices. For jsut one quote, click reply. For multiple quotes, click quote.
Here's a screen shot.
Then when typing into the reply box, click the "Insert Quotes" button will let you chose one or more of the quotes you selected.