Chosen Solution

That highlighted part is the ear speaker which goes on top of the front camera flex

Thank you so much Charlie. Not sure if I understand this right: where exactly should I put it? I’ll just send a more detailed picture of it, but bear in mind, it’s not more than 5-6 mm, so much smaller than you see it here. But should you be right, then (again, sorry) where do I put it? Thanks again for your help, Hans