On the homepage of the Asset Library click on the Create Share Link button as seen below.
Once selected you will notice a checkbox on each asset. You can now navigate through the library and select asstes that you would like to share externally.
After selecting your assets, you can also add a customer title and text to the page to give it a more personal/custom touch.
Now you can click on the Create & Copy button and the link to your custom page will be saved to your clipboard and can be shared with your prospect/customer. See example below.