1. Link to attachment page for the media is the best option
2. But sadly it doesn’t work in case of selecting multiple media items at a time.
Ok os some googling I found that doing this on .org site is easy, but not in .com site (unless u want to do it individually for each image, which can be done at the time of upload).
But for me I do bulk uploads and in each post, have >1 images added and so I would hate to do it manually for each, at any point of time.
So then I found a Gallery option whereby I can create a slideshow etc.: http://en.support.wordpress.com/images/gallery/
Selecting multiple files in order, makes the selection inverted, so make sure u invert order using the Button Slideshow option is too small
Circles is good and gives a neat full screen carousel to browse
Thumbnail Grid is THE BEST as it opens the same full screen carousel
Mosaic opens the same full screen carousel but shows cluster in the post Body
Square Tiles is same
NOTE That for all these I had set link to a Attachments page, WHICH ACTUALLY DOES EXACTLY WHAT I WANTED IN THE FIRST PLACE, THAT IS LINK ALL MEDIA ITEMS TO THE ATTACHMENT PAGE AND NOT THE MEDIA FILE but changing it to “Link to Media Files” LINKED ALL THE ITEMS TO THE FULL SCREEN IMAGE THAT I DID NOT WANT…
ALSO NOTE THAT LEFT CLK. ON ANY ITEM IN THE POST OPENS IT IN THE CAROUSEL, SO TO SEE THIS DIFFERENCE, RIGHT CLK AND OPEN IN NEW TAB
for >1 media items in a post, always create a Gallery with Settings: Link to Attachment and Type as Square
PS: Another issue with the Media Lib is that when u open it from New Post page to add stuff to it, it does not show the titles of the items and so selection becomes a pain.
Instead upload the items at this stage only and not beforehand to avoid this issue.