Here's how I do it. There may be a better way but I have no clue.
First, click using the NLG site navigation menu: My Videos & Photos.
Then click "New Album" I think by default you have to create album once.
Next, there will be some blue banners that appear when you create go into the album.
Click "Add an item to this album." Then add the item as you would on a regular NLG post.
Once it uploads it should show you the Direct Link URL (or if it's existing, you press DETAILS at the bottom)
Copy that link!
We're almost there! Don't fret.
Write your PM to whoever. Click the INSERT IMAGE icon. For me, it's under the B (bold) icon. You might just have to hover around til you see it.
THEN... put the direct link smack dab in the middle. For me though I have to add back the right bracket so either add a space or do what I do and just add it back.
I always press PREVIEW to ensure I haven't screwed up.
This is convoluted but after doing it a few times, It's fairly easy.