I'm making an iOS app, sorry for the confusion. So, if it is a Sandbox issue and I'm making an iOS app, what can be done?

I'm working on an iOS app, sorry for the confusion. If the file permissions are not the problem, then what can be done? Thanks.

Sorry, I didn’t know that the Sandbox was exclusive to macOS, but I mentioned it because it was suggested on other posts of people with the same error as me. I'm working on an iOS (14.0 - 16) app.

Sorry, I didn’t know that the Sandbox was only for macOS. I mentioned it because it was mentioned on other posts of people with the same error as me. I'm working on an iOS app.