When you receive a document via email, you will normally see a hyperlink to click on, but in some cases, they might also send a thumbnail link that you can click to open the document. It will look similar to the below image.
To view the document, simply click on the hyperlink or thumbnail image and it will open in a new tab within your browser.
Once opened, you will be able to view it and take any necessary actions, like download, print, share, comment, or sign.