Picture Disappears after certain time

Sometimes I put A picture (to draw something on it)on timeline, then I find that the picture becomes invisible from a certain point in timeline. Why does it happen? look at the screenshot, the picture is 505 frame long but it is visible until 305 frame, then at 306 it becomes invisible, why does this happen?

AA1.png (42.56 KiB) Viewed 1548 times

AA.png (95.06 KiB) Viewed 1548 times

Try doing all the effects, including re-timing, in Fusion.

Try doing all the effects, including re-timing, in Fusion.

I m new to Davinci-16, Dont know what u meant by "all the effects" and "retiring"
I replaced the mediaIn in Fusion with a new MediaIn(Same Picture), Now the picture becomes invisible from Minus Zero Frame onwards. What is the Minus Portion in the Fusion, what does it indicate?

AA2.png (92.95 KiB) Viewed 1499 times

The minus portion usually indicates that you placed the image on the timeline then lengthened it from the left side, which when switching to the Fusion tab goes into negative frame numbers.