How many quick replies can add in twitter direct message? And when can I use this quick reply feature in twitter? which API should I use for sending image in direct message for twitter?
Here you can find all the detail you need
https://dev.twitter.com/rest/direct-messages/quick-replies
if you choose option list then you can mention up to 20 Options in quick reply
https://dev.twitter.com/rest/reference/post/media/upload
Here you can find Media upload API detail, after upload media you will get Media Id that id can be passed along with direct message.