Higher resolution photos will result in larger file sizes so try readjusting the 'Resolution' option in your Camera app Settings menu. Different manufacturers put different Camera apps on their devices so you'll have to be a bit flexible to find the menu in your tablet's Camera app. It might be in the upper or the lower menu bar of the app, and it might have a text identifier actually named 'Settings' or it might be just something like a gear icon. Anyway, there will be options like 'Resolution' and/or 'Image quality' that you can alter so the default resolution is lower. The default will probably be the highest (i.e. maybe 3264x2448 or thereabouts) so pick one of the lower res numbers (i.e. 2048x1152) and take a couple of test pics to see if the file size is easier for you to work with. Keep in mind that you don't want to make your photos too low res, at some point the image quality will become noticeably dodgy.
The default Camera app you already have is adequate and usable as is, and you can make it better if you take the time to mess around with the various options in the app's Settings menu. If you want a Camera app that has a larger feature set and is more configurable, I'll recommend you install this 'Open Camera' app:
https://forums.androidcentral.com/e...orge.opencamera&hl=en_US&gl=US&token=OHSdjgGH
It's actively supported (and it'll run on a KitKat device) and has an extensive number of user configurable options buried in its Settings. But it's still just a camera app so if your tablet's app is all you need and want, this won't be anything that much different.