How to clean up files on iPhone 13 mini

Start with Settings > General > iPhone Storage. It lists what's taking space and suggests things like Offload Unused Apps and reviewing large attachments in Messages. Also check Photos > Albums > Duplicates and Recently Deleted, since deleted photos keep taking space for 30 days until you empty that album.

Tovi-SafeFinderUninstall wrote:

How do I clean up files on my iPhone 13 mini

Delete the ones you don't need or want. Otherwise, what do you mean by "clean up files?"