So, their suggestion is to "Make sure the camera cover is not thicker than an average piece of printer paper." and also "Avoid using a camera cover that leaves adhesive residue."?
Good luck finding a cover that is thinner than a piece of paper and is also not tape.
Portuguese has frequent spelling reforms, with over 10 reforms since 1911. The most recent one started in 2009 and had a transition period that ended in 2016.