Image Capture: download to subfolder; etc.

Welcome to the Apple Support Communities!

I understand you have some questions about your workflow for importing images from your Panasonic camera to your Mac mini. I usually find it easier to create the subfolder in the Pictures folder before connecting a camera so the subfolder appears in the list of options. But you can still create the subfolder and organize them after import.

1. Open Finder
2. In the menu bar choose View > As List
3. Click the Date Modified column heading and to sort with the most recent date on top.
4. You should now see all of your pictures listed
5. You should see the photos that you want to move to a subfolder
6. Click on the first image to select it.
7. Press and hold the Shift key and click on the last image.
8. All of the selected images are blue.
9. Release the Shift key.
10. Right-click or Control-click on the first selected photo.
11. From the contextual menu that appears, choose "New Folder with Selection (# items)"

If your goal is to have these images in your Photos Library, you can drag this subfolder to the Photos icon on the Dock to import them.
Or, you could have used the Import command in Photos initially. All of the images would have been imported, and then you could create an album for the new images.
Coming full circle, if for some reason you are not able to import to the Photos app directly from your camera, then Image Capture is the best alternative.
I'll include a few resources here for you:
Image Capture: Transfer images and other items from your device​
macOS High Sierra - Import photos from a camera or phone
Digital camera RAW formats supported by iOS 11 and macOS High Sierra
Take care.

Welcome to the Apple Support Communities!

I understand you have some questions about your workflow for importing images from your Panasonic camera to your Mac mini. I usually find it easier to create the subfolder in the Pictures folder before connecting a camera so the subfolder appears in the list of options. But you can still create the subfolder and organize them after import.

1. Open Finder
2. In the menu bar choose View > As List
3. Click the Date Modified column heading and to sort with the most recent date on top.
4. You should now see all of your pictures listed
5. You should see the photos that you want to move to a subfolder
6. Click on the first image to select it.
7. Press and hold the Shift key and click on the last image.
8. All of the selected images are blue.
9. Release the Shift key.
10. Right-click or Control-click on the first selected photo.
11. From the contextual menu that appears, choose "New Folder with Selection (# items)"

If your goal is to have these images in your Photos Library, you can drag this subfolder to the Photos icon on the Dock to import them.
Or, you could have used the Import command in Photos initially. All of the images would have been imported, and then you could create an album for the new images.
Coming full circle, if for some reason you are not able to import to the Photos app directly from your camera, then Image Capture is the best alternative.
I'll include a few resources here for you:
Image Capture: Transfer images and other items from your device​
macOS High Sierra - Import photos from a camera or phone
Digital camera RAW formats supported by iOS 11 and macOS High Sierra
Take care.