Hi there! I understand you're having trouble with the Blinkay app not capturing a photo of your vehicle for registration. Let's work through this together.

First, just to clarify a couple of things:
- Are you receiving any error messages when you try to take the photo?
- Does the app open your Mac's camera at all, or is it just not saving the photo?
- Have you granted the app permission to access your camera in your Mac's privacy settings?

Since you're using a Mac with OS X 10.15.7, camera permissions can sometimes block apps from accessing the hardware. Here’s a step-by-step to check and potentially fix this:

1. Check Camera Permissions
- Click the Apple menu at the top-left corner and select "System Preferences."
- Choose "Security & Privacy."
- Go to the "Privacy" tab.
- Select "Camera" on the left pane.
- Make sure that Blinkay is checked/enabled here. If it’s unchecked, check it and then restart the app.

2. Restart the Blinkay App
After enabling camera access, fully quit the Blinkay app (Cmd+Q) and reopen it. Try capturing the vehicle photo again.

3. Test Your Camera
Open another app that uses your camera (like Photo Booth) to make sure your Mac's camera is working normally.

4. App Update
Ensure that your Blinkay app is up to date. Sometimes bugs fixed in updates can cause photo capture issues.

5. Internet Connection
Verify that you have a stable internet connection, as sometimes the app may need to upload the photo immediately.

If you've already tried these steps, please let me know which ones, and if you see any specific error messages or behaviors. That way, I can help dig deeper or guide you to the next best fix.

Are you comfortable with checking those camera permissions first?