How to adjust default photo size?

In Settings->Zip Settings, you can change the Default Photo Size option for your photos from your Photo Library. The options are:

• Original Photo Size: photos can be up to 3032X4048. This is the maximum size available.
• Medium Photo Size: photos can be up to 2048X2048. This is the default.
• Small Photo Size: photos can be up to 1024X1024. 

This setting is used when importing photos from your device's Photo Library.