Infigo allows you to switch on a downloadable PDF soft proof per storefront from the editor screen.
A Soft proof is a great way for a user to assess the file they are creating, but a watermark, and lower resolution prevents them printing it elsewhere.
Turn on the Preview
To enable this please navigate to Configuration > Settings > Product and Editor Settings > Editor Settings.
Locate and enable these settings:
editorsettings.SingleWatermarkEnabled:
editorsettings.BatchWatermarkEnabled:
This will enable the 'Download Preview' button in the bottom left corner of the editor

Change the 'Preview Text'
By default there will be a watermark on the preview which is removable. The default text is "Preview", you can change this within the Language Strings.
1. Navigate to Configuration > Languages, then click View string resources for your primary language.

2. On the next screen, press the filter button to the right of Resource name.

3. The filter will drop down, change the value to Is equal to and copy Catfish.EditorSettings.WatermarkText in the blank space. Press Filter.

4. You will want to find the setting Catfish.EditorSettings.WatermarkText. Press Edit and change the value. I changed the new value to 'Proof'. Be sure to press Update.

5. The new text will now appear on your template!

Please note, if you would prefer to have no watermark text then please use this 'fake' space as the language field can not be saved when nothing is present.
You just need to copy the space between the bold brackets [ ].