Device Maintenance option. If so click on it. It will scan your phones settings and offer an Optimize Now button. Press the button. Then click done at the bottom or the back button snd you will see 4 additional checks thst you can run at the bottom. Run each if those. You will have to hit the back button after each one to get back to the main page. The storage button will bring up an analysis of your storage usage. If you are very low on available storage space you should select the categories below and delete some of the files or apps to free up space