I am trying to add a new screenshot in either the png or jpg format to a product page of an existing app. When I try to reorder the screenshots, App Store Connect says the new screenshot is not in the RGB color space. Preview, which created them, and Finder both say they are in the RGB color space. What should I do?

In the past QLThumbnailImageCreate would return an NSImage from a url pointing to a webarchive. It's not doing so now. Is this a bug, or do I not understand something?

There are a number of answers to this question on the web. The latest that I have found is for early 2020, and it no longer seems appropriate. What is the current method?

When a user is editing a NSTextView and commits some kinds of operations (e.g. Quiting an app), the NSTextView's textStorage does not contain the current contents of the NSTextView. How do I get the current contents?

If I set a breakpoint in drag and drop within ...AcceptDrop... [in a NSOutlineView], both the app and Xcode hang. The only way I know to handle this is to force the app to quit then open Xcode. This shows the breakpoint, but the app can not continue. Is there a better way to handle this?

On launching my app from Xcode, my document-based app automatically apparently tries to load a cached document from a previous launch. That document appears to be corrupted as the app crashes in initWithCoder [which was called from readFromData:]. The solution appears to be to delete the cached documents. Where are they located and is there anything special about deleting them?

I suspect that my mac app's savedstate data is over full. I've been doing a great many launches of my mac application which involves creating new files, then breaking back to Xcode. Now a stable compiled version and a later version launched from inside Xcode both crash. The Xcode crashes are preceded by NSDocumentController calls that include the suggestive phrase: "... makeDocumentForURL:withContentsOfURL:alternateContent...". As this occurs before control is given to my code, it must be part of document-based app's launch activity. The only thing I can see to do is to delete the app's savedstate data. How do I delete this savedstate data? The instructions on the web are out-of-date.