MacOS – How to select a file or directory inside a package

You can use the Search feature in Finder to limit the view in a specific folder to search criteria that matches what's in the search field. One of the criteria you can search on is kind. In the screen shot below I start typing kind:jpeg in the search field and you see that Finder presents me with a drop down list that includes JPEG Image. I select this from the list and I'll see only files of that kind. To limit the filter to just this folder I make sure the Downloads view is clicked on the Search: area just about the list of files instead of This Mac.

Once you've searched and filtered your view this way, you can select all to perform an operation on files that match that search.

I created an Automator application that does what you're looking for. You can download it here.

It's pretty simple, just drag-and-drop any folder onto the application, it will then find all images in the folder and any subfolders, and prompt you for a destination to copy them to.

If you'd prefer to activate it by a hotkey or the right-click menu, you can make it into a service by following these steps:

1. Open the application in Automator.
2. Choose File → Convert To… and select Service.
3. Change the first drop-down at the top to folders.
4. Save it and give it a name.
5. Optional: open the Services menu within Keyboard Preferences. You can assign a keyboard shortcut there.

Once you've done that, you should be able to activate the service by right clicking on any folder, or hitting your shortcut key with a folder selected.