Different assets

What do you mean by "not mixed with the photos"? Having a mix of asset types in your account is irrelevant to Buyers.

Buyers won't even see what you intend to do. They search for items, and your internal organization is of no use to them.

I need help uploading different kinds of assets without mixing them.

By @dsadigital

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I understand Stock stopped accepting abstract backgrounds.  They have more than they can sell.

Don't waste your time separating submissions.  Customers use keyword searches & filters to find the assets they want.

Just upload your very best work and give them good titles, keywords & descriptions.  The rest takes care of itself.