On a smart phone, it might be easiest to stick to the first method discussed in this thread. You can quote an entire message you’d like to feature from another post by clicking the “feather” icon from the lower right corner of that post. When your message composition box appears, you can remove the extra part of the message you don’t want to feature by deleting it like you would in any other situation where you’re editing text.
Submit the message, and you should be all set. Feel free to test it out here!
Mod 1