Tool-tip snapshots

Tool-tip snapshots are only available under the following conditions:

To get a small snapshot of a file's contents, hold your mouse over the cell of the filename. The beginning of the file (up to 250 characters) will be displayed within the tool-tip help. If the file's contents cannot be displayed for any reason (for example, the file contains binary data), the tool-tip text will indicate the reason for non-display. Unlike other tool-tip help where the text is displayed for a maximum time period (usually a few seconds), this particular help is displayed as long as your mouse is over the filename. 

You can select a range of rows, or multiple ranges, using the Shift and Ctrl keys. When selecting multiple rows, hold down the Shift/Ctrl key while right-clicking to display the menu. Release the Shift/Ctrl keys prior to clicking a specific menu selection.
Note: For the web UI, it is particularly important to release the Shift and Ctrl keys prior to making the menu selection, as leaving either depressed could bring up another browser tab.