Do you have this information for reference? No, I do not. That is why I said in my first reply that I was guessing. Read the comment to my earlier answer from an Apple engineer. You must update to Xcode 13 to test your app on the iPad Mini 6.

My guess is Xcode 11.4 does not support iOS devices introduced after Xcode 11.4's release, which was March 24, 2020. The iPad Mini 6 came out in 2021. Do you have another iOS device introduced after March 2020 to test my guess? You most likely need to update to a newer Xcode version to install your app on the iPad Mini 6.

If you are writing lots of small programs for a C programming course, you are better off using a text editor like VSCode, Sublime Text, BBEdit, or TextMate to write your code instead of Xcode. Xcode requires a project to create an executable file. You can't just create a C file in Xcode and run it. I know TextMate has a C bundle that lets you run your programs from inside TextMate by choosing Bundle > C > Run. I'm sure the other text editors I mentioned have ways to run your programs from the editor.

Xcode has a Search Paths collection of build settings where you can add search paths for headers and libraries. Select the project file from the project navigator on the left side of the project window to open the project editor. Select the project from the left side of the project editor. Click the Build Settings button on the top of the project editor to access the build settings. Entering Search Paths in the search field will show the Search Paths collection.

The image does not display because of a file permissions problem. If I turn on the App Sandbox and give the app Read access to the Pictures folder, the cover image appears when I open the metadata editor.

I created an outlet for an image view and called a function in the view controller's viewDidAppear method to load the metadata. I had the following line of code to set the image: coverImageView.image = NSImage(contentsOf: book.metadata.coverFile)

Below the Add button in the toolbar is a set of three buttons. Click the middle button snd choose Side By Side Comparison to use side-by-side comparison.

The upload error went away when I updated to Xcode 13.