The Documents tab on the work orders page (and any other page that has a Documents tab) has a Preview button next to any file that is a supported image format (.jpg, .png, .webp, .bmp, .svg and .gif):
Clicking preview displays the image in a popup window:
Additionally, you can preview PDF files:
There are arrows on the left and right sides to scroll through the available documents in the grid. The title bar of the image or PDF file shows the filename.
