How to create a DMG installer for an applications on macOS 2021

- Please watch the upper ☝︎ video carefully and follow the steps. (in case the video doesn't work, press on this link) 
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Hello everyone in this video tutorial I have explained how to create a DMG container folder in a very easy way using macOS native applications without using any third-party applications.
you can easily follow the described steps and at the end of this tutorial you will be able to: -
- Create a dmg container file. 
- Make it "read only" to prevent anyone from modifying it.
- Create a new simple application. (these are the complete steps)
- Add your application inside the DMG container.
- Customize the container folder background.