A watermark can be added to an image file that's being shared by email or collection link. The DRM option must be turned on with valid watermarks for this option to be made available.
To add a watermark before sharing a file:
1) Click the share icon and choose either the email or collection link option.
2) Click Enable Watermark and select the watermark to overlay on the image.
The size and position of the watermark can be edited in the Digital Rights Management settings.