That is a great feature that can help you with planning posts. However, you should be aware that the preview does not represent 1:1 the final post. It might look slightly different owing to the number of views available and the continuous development of social networks.
Post preview is supported by the following social media:
🔶 Facebook,
🔶 LinkedIn,
🔶 Twitter,
🔶 VK,
🔶 Instagram,
🔶 Google My Business,
🔶 Pinterest.
Here is what you will get on the particular social media after clicking on post preview.