There is a new and different look to the upgraded version.
This is just a short run-down of how it's done.
First, you have to hit "reply"... then...
You begin by clicking on the "paper clip" shown in the icons above.... or the manage attachments button in the optional area.
A window such as this pops up. Click on "add files".
You then get this window. Click on "select files".
(A new window pops up so you can find and select.)
You can select several files to upload by just using "ctrl" (control) *click
After selecting, hit "upload files", and wait till it's done.
When upload is complete, they show in the lower window. Now hit "Done".
You will then be returned to the main reply page.
Click on that paper clip again, hit "insert all", and you get this.
Notice how the attachments are strung out. You need to separate them into their own lines. (add a space, makes them easier to see)
Final result looks like this.
As with the old way, you can also add spaces and text between the pix.