After adding an attachment to a comment on a change order (this is typically a .pdf in our use case) it is unintuitive as to the required steps to open and view the attachment.
Current process is:
1. Right click on the comment that has an attachment and select "Attachments..."

2. Attachments window pops open, and it prompts you to select a file to view. Notice that there are two buttons in the top right that will disappear in the next step, "View..." and "Update..."

3. Here's where things could be improved, once you have selected the file you wish to view, the thumbnail for the file version pops up. This has been a dead end for most of us using this feature as the "View..." button disappears from the UI. You have to click on the thumbnail to open the file. This is not intuitive.

4. Better yet, if you don't have the PDF viewer installed, you are told to click the "Open" button to view the attachment with an external viewer. The "Open" button does not exist, and you have to click the "View..." button to open the attachment in an external viewer.

How to improve this process: Make it so that when you double click on any attachment in the Attached Files list, it opens that file using an external viewer.