iOS App Developer SwiftUI + Xcode

SwiftUI App is connected to a backend for storage: images, categories and sound files(MP3). I want to remove this backend code from the project and load all files from Xcode locally instead. Files are already there.
Then
- Make sure all is working and mp3 files play in App.
- Fix any bugs and tidy up.

App: Meditation
Backend: back4app
SwiftUI
Latest Xcode