iPhone 6s "other" takes huge space

Hi.

i have iPhone 6s and its low on storage because "other" is taking up around half of the storage.

i tried contacting apple support but apparently my device is not covered for technical support or i dont know.

this also happened on my iPhone 6. i have almost nothing in there but there is a huge space taken by "other"

i restored this device in April because of the same issue and now it happened again

thank you so much for your help :)