Issue Summary

Yes, In the macOS Trello app, whenever I open an image a certain way the application gets stuck in the image preview popup and can't be closed.

This problem persists even after restarting the application, essentially rendering it useless because I can't close the image at all. 

Steps to Reproduce

1. Create a new card
2. Attach an image on the card
3. Create a checklist on the card
4. Add a new item to the checklist
5. Open the attached image then right-click and select Copy Image URL
6. Edit the checklist item and add the link in Markdown form like [screenshot](the copied URL here)
7. Click on the link in the checklist item
8. It should open the image preview but no way to close it, I tried hitting ESC, clicking outside the image, etc.

Expected Results

Closing the image window and back to the board/card view. 

Actual Results

The page is frozen and no way to go back to the previous page. 

Workaround

Suggested workaround: Using the web browser instead of the desktop app