Upload image button does not work in marketplace sample scene

[JAlbertCode]

Describe the bug
When you try to upload an image to deploy a new marketplace, it does not do anything and therefore you can't proceed with minting the marketplace.

Steps
Steps to reproduce the behavior:

1. Run the MarketplaceSampleScene as a WebGL build
2. Click on marketplace > create.
3. Fill out the name, description, and click upload image.
4. You'll see that it does not upload the image.

Expected behavior
The user should be able to upload an image and then mint a marketplace contract.

Console errors
SendMessage: object ImageUploader not found!

Desktop (please complete the following information):

• Chainsafe SDK version: 2.6.0, Marketplace V2.6.1
• Unity Version: 2022.3.19f1
• Operating System: Windows 11 Pro

Additional context
I am using the dev branch to test the marketplace sample scene.

[kantagara]

Marketplace samples should just be used for dispaying and purchasing items from the marketplace itself.