It won't let me move on to the next steps in the character creation screen.

Did you create a character with a photo?

If you don’t allow gallery access, you can’t use a photo to create a character.
Please go to Settings on your phone and allow gallery access for ZEPETO.

For Android users:
Please allow the used permission at [Device Settings > Apps > Zepeto > Permissions].

For iOS users:
Please allow the used permissions at [Device Settings > Zepeto > Permissions].