You might have the posts that are very important and must be shared and checked from the all participants. In this case, Pinning would be very useful. You can only pin the posts you wrote, but the project administrator can pin all the posts to the top.
[Web]
1. You will see a 'Pin icon' on the top right corner of the post. If the posts have it, it means that you can pin it to the top.
2. Once you select, you’ll be asked again whether you want to pin it or not. If you confirm, it will be pinned on top.
[Mobile]
1. You will see a 'Pin icon' on the top right corner of the post. If the posts have it, it means that you can pin it to the top.
2. Once you select, you’ll be asked again whether you want to pin it or not. If you confirm, it will be pinned on top.