Display Screen or Portion Thereof with an Animated Graphical User Interface

FIG. 1 is a front view of a first image in a sequence of a display screen or a portion thereof with an animated graphical user interface, showing the novel design;

FIG. 2 is a front view of a second image thereof; and,

FIG. 3 is a front view of a third image thereof.

In FIGS. 1 - 3 the solid lines illustrate the claimed ornamental design. The outer-most broken lines illustrate a mobile device, which forms no part of the claimed design. The remaining broken lines illustrate portions of the display screen, and portions of the graphical user interface, and form no part of the claimed design. The stippling forms no part of the claimed design.

The appearance of the animated images sequentially transitions between the images shown in FIGS. 1 - 3 . The process or period in which one image transitions to another image forms no part of the claimed design.