Please Help me add memory

See if anything here helps. 

Disk space - How to check the storage on your iPhone, iPad, and iPod touch.    

 Disk Space – Free Up    

 Disk Space – Free Up (2).  

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Hallo denet,

In case you need additional physical storage for your iPhone (with lightning connector) you can buy external memory sticks with lightning and USB connector.

When traveling I use one to store large videos to save storage on my iPhone. I copy them to the stick and then delete them in Fotos on the iPhone. Back home I connect the stick to my Mac and transfer the videos to it.

The only way you can add storage to an iPhone is to buy another iPhone that has a larger disk space.

Hi, you can purchase I cloud storage: https://support.apple.com/en-us/HT201318

You are welcome.