We claim the ornamental design for a display screen or portion thereof with animated graphical user interface, as shown and described.
FIG. 1 is the first image in a sequence for a display screen or portion thereof with animated graphical user interface showing our new design;
FIG. 2 is the second image thereof;
FIG. 3 is the third image thereof; and,
FIG. 4 is the fourth image thereof.
The appearance of the animated graphical user interface sequentially transitions between the images shown in FIGS. 1 to 4. The process or period in which one image transitions to another forms no part of the claimed design. The outermost broken line represents the display screen or portion thereof and forms no part of the claimed design. The broken lines within the display screen represent text and portions of the graphical user interface that form no part of the claimed design.