IOS app caches and slowly fills up ipad memory

Sure all IOS apps grow over time. Photos grow because you take pictures but if you delete them the size is reduced. Whatsapp grows because the app saves your conversations but the app has an option to delete conversations and the size of the app reduces, etc, etc, etc. The sandisk app increases because is caching data (thumbnails…etc) but there is no option to delete that. This is what I’m reffering to… So not, is not Apple, is Sandisk I should address about this issue/request.