imagerectoffset for animated image not working how to fix it?

so basically im making an animated image with spritesheet because roblox hasnt added gif support so im using imagerectoffset

the screen gui its like this: StarterGui ScreenGUI ImageLabel LocalScript Value (BoolValue type "Value its off") here is the script

local imagerectoffset = script.Parent.ImageRectOffset
local time = 0.01666666666 --60fps
local value = script.Value.Value
repeat
    imagerectoffset = "0, 0" --1
    wait(time)
    imagerectoffset = "204, 0" --2
    wait(time)
    imagerectoffset = "408, 0" --3
    wait(time)
    imagerectoffset = "612, 0" --4
    wait(time)
    imagerectoffset = "816, 0" --5
    wait(time)
    imagerectoffset = "0, 149" --6
    wait(time)
    imagerectoffset = "204, 149" --7
    wait(time)
    imagerectoffset = "408, 149" --8
    wait(time)
    imagerectoffset = "612, 149" --9
    wait(time)
    imagerectoffset = "816, 149" --10
    wait(time)
    imagerectoffset = "0, 298" --11
    wait(time)
    imagerectoffset = "204, 298" --12
    wait(time)
    imagerectoffset = "408, 298" --13
    wait(time)
    imagerectoffset = "612, 298" --14
    wait(time)
    imagerectoffset = "816, 298" --15
    wait(time)
    imagerectoffset = "0, 447" --16
    wait(time)
    imagerectoffset = "204, 447" --17
    wait(time)
    imagerectoffset = "408, 447" --18
    wait(time)
    imagerectoffset = "612, 447" --19
    wait(time)
    imagerectoffset = "816, 447" --20
    wait(time)
    imagerectoffset = "0, 596" --21
    wait(time)
    imagerectoffset = "204, 596" --22
    wait(time)
    imagerectoffset = "408, 596" --23
    wait(time)
    imagerectoffset = "612, 596" --24
    wait(time)
until
value == true

thanks