I'm almost certain this is an Adobe Stock question, not a software question.
You don't have to do anything to transfer the license. You're acting as an agent for the startup. You are transferring the rights to use the image/video to your startup and the startup must comply with the license terms & use restrictions. If you wanted to use the same image/video on a 2nd project, you'd need to buy another license.
Yes this was a Adobe Stock question.
I ended up by calling Adobe support, got moved around between multiple persons... for getting a fuzzy answer that I cannot exploit...
I believe though that the startup will be able to use it as an employer can use a photo licensed by an employee in its own name...
To give you another very common example, a web designer purchases images/videos for use on a client's website. At completion, the website becomes the client's responsibility. So you don't need to do anything.
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Nancy is correct!