Firstly, install browser extension from here https://s3engage.com/app/tools

Now, you can quickly add content to your library from any website. No need to leave the web page. Plus, with one click, you can autoschedule your posts, ensuring that your links are shared at optimal times.

When you drag on image or content there is an option of share image on the top right corner.

It gives 3 choices
Share
Schedule
Add to Library