Arjun,
I don’t see the “attach” button, just the “Insert into post”
Yes, there will not be attach button. I mean to say,
– Click on Add Media Button
– Upload Files to this post (When you upload any image to the post, they are attached to this post and also available to galley as well)
– No need to Insert into Post – simply close the Insert Media light box
Now try again and post your results.