How to make explosion box step by step

How to make explosion box step by step， please check the following link video:
https://youtu.be/w42u2P0h1Kg

Valentine's Day Present DIY Surprise Love Explosion Box Gift Explosion for Anniversary Scrapbook DIY Photo Album Birthday Gift
Features:
Photo Album Box
Easily make a creative explosion box by yourself. Put the photo on the pull-out bar or install it on the frame, you can DIY a magical special photo album for your parents and friends.
Explosion Box
When open the box, the picture blowouts out like flower open, then memory flows. Big surprise to your lover, family or friends.
Handmade DIY
You can stick the photos by your own order, write the love words on the corner heart to show your love and warm care to those you love with something different!
Widely Use
Perfect gifts for wedding, engagement, anniversary, birthday, baby shower, Valentine's Day, Mother Day, Christmas, etc. Apply to marriage proposal, photo album and travel record.

Specification:
Item Type: Explosion Box
Material: Paper jam
Color: Black
Quantity:1pc
Big Size: 44*44cm/17.3*17.3"(L*W)
Corner Heart: 9.5
Net Weight: 270g/9.5oz

Package:
1*Explosion Box