Hi Vladimir, thank you for your feedback!
In order to stick the foil correctly on the edges, you need to arm yourself with a little patience and follow the installation steps, especially step 8: Press each area of the foil on the curved edge with the palm bridge, 5 seconds, until it sticks. If the foil does not stick to certain parts, resume the process after a 10-minute break.
The foil for the camera can be installed with a smaller amount of gel, and if you notice that the foil is moving and you can't remove the gel with a spatula, wait until it evaporates a little from the gel and try again.