Ok, I am going to write from the perspective as myself here and not as a moderator since it had nothing to do with Renderosity.

The original link for the tutorial I have used seems to be dead - but you can just do a Google search for  "creating metadata for daz studio" and you will see many links to tutorials.

As for the Product image itself, I can tell you where it lives in your DAZ content folder:

/Runtime/Support

There will be two data files for each product - a .dsa and a .dsx file. These are the files that contain your metadata.

If there is also a .jpg file with the EXACT same name as those two files, that is typically the one that will show up in the DAZ Studio for your product.
It is important that this .jpg is the correct size - I have used 180x254 which has worked well for me.

I have been able to create DAZ Studio products from scratch from my own content and then create my own jpgs. I have used it for everything from my own products to my personal DEV libraries for materials, promo templates etc. Also for any DAZ Content I have bought from Renderosity. You can think of them as virtual products.

The process basically involves clicking on a content folder within DAZ Studio and selecting "Create a Product from..."
Then there is still a bunch of things to do if you don't want your database to get all messed up - like cleaning out duplicates from the LOCAL USER default product. Also using the Content DB Editor while you have a product selected to add things like a vendor name, product number or your own system code.

Then there is also the whole process of linking props and clothing to the correct base figure and adding Smart Content Categories (I have created my own separate Smart Content Library where I have everything organized the way I like it.)

But to learn how to do that you really need to go look at a few tutorials. It's not impossible to learn, but it does take quite a bit of patience and a bit of trial and error to master.

Now, for certain DAZ Studio products that have been downloaded via the DAZ Studio content managament app, I have indeed have issues with a few products where the thumbnail was missing, I have replaced or updated it and it still shows as missing. Something else is going on where the thumbnail is sourced and updated automatically from somewhere else and I have not figured out exactly what.

If you are seeing double icons, there is a good chance that you have some sort of conflict between installing content via the content manager and the in-app (DAZ Studio) download system. I avoid the in-app download system like the plague lol because it installs things in a completely different location and just messes things up,

But yeah I have a few of those where I managed to get DAZ Studio to show my override Product thumbnail for a little while  - and then it just reverted to be missing again. So I just gave up fixing some of that in the end.

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