1SE doesn't sync your content across devices. Your snippets stay on the device where you made them.
Move your content to a new device
Back up on the old device and restore on the new one: see How to Move to a New Phone.
Work on a project together
In a Freestyle Collab project, you and others add snippets to the same project and make a shared mash: see How to Use a Freestyle Collab Project.
If you have questions, contact us from Settings > Contact Support in the app.