Can't upload designs. There is no button. :/

I extended the time, please try again

Inside the grid, we have only these types of squares:
1. Empty: empty background design
2. Rock (as square): rock background design or anything similar
3. Arrow: rock background design + arrow shape
4. Number: empty background design + number
5. Ball: empty background design + colored ball + number inside the ball

Still can't find the upload designs button. I spent hours making the design without noticing there is no button.

Is it only for specific type of designers?

I don't know why, please ask the support