Hi mistaflutje,
I’d recommend you to try it out our Text to Avatar feature or you can also try our AI Animation Generator
as well which you also can access thorugh the Generate Video > References and >Add your avatar picture there<.
Right now, the Text to Avatar tool is designed around a specific catalog of pre-built characters, which is why you aren't seeing a button to upload your own custom file.
However, if you want to use your own artwork, I highly recommend using the Generate Video feature (our AI Animation Generator). There, you actually can upload your custom avatar as an image reference to guide the video generation and bring your design to life!
Alternatively, if you are looking to do full motion capture, the Adobe Character Animator might be a better option for you, it`s worth to have a look.
Let us know if you have any questions or need help setting up the image reference.
Thanks
Matt