Display Screen or Portion Thereof with an Animated Graphical User Interface

FIG. 1 is a front view of a display screen or portion thereof with an animated graphical user interface showing the claimed design;

FIG. 2 is a second image thereof; and,

FIG. 3 is a third image thereof.

The broken lines in the figures show portions of the animated graphical user interface that form no part of the claimed design. The white surrounding the broken lines form no part of the claimed design.

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