Could always switch to another camera app and screenshot app.
I have two different camera apps installed, I use the stock one too but the other one has advantages occasionally. Like no sound and option to have timestamp and location "stamped" on the image.
Then again do remember that in some countries it appears to be illegal to disable the shutter sound. (So do owners of old film Leicas have to ring a bell when taking a photo or something? Oh well...)
Registered in September 2016. First post passed moderation: (pending?)