Display screen or portion thereof with an animated graphical user interface

[0001]FIG. 1 is a first image in a sequence for a display screen or portion thereof with animated graphical user interface showing our new design; and,

[0002]FIG. 2 is a second image in the sequence of our new design.

[0003]The outermost uneven-length broken lines of FIGS. 1-2 illustrate a display screen or portion thereof, in an environment of use of the design with an electronic device, and form no part of the claimed design. The uneven-length broken lines show the bounds of the claimed design and form no part of the claimed design. The negative space between the uneven-length broken lines and solid lines forms no part of the claimed design. The even-length broken lines within the display screen or portion thereof of FIGS. 1-2 illustrate portions of the graphical user interface, and form no part of the claimed design.

[0004]The appearance of the transitional image sequentially transitions between the images shown in FIGS. 1 and 2. The process or time for transition from one image to another of FIGS. 1-2 forms no part of the claimed design.