I am trying to set exact start and end times for images imported as clips. See screen shot at
https://drive.google.com/file/d/1Pc35nORwVziQ0w5sRmAtUDgHjlIOXucO/view?usp=sharing
The help file says "On the clip preview's timeline, the Start Time shows as a red triangle, and the End Time shows as a blue triangle."
I do not see any triangles.
"Alternatively, move the clip preview's current playback position and select Clip -> Player -> Set Clip Start Time or Set Clip End Time, or click the red or blue flag icon button."
In the menu, Set Clip Start Time and Set Clip End Time are grayed out. What am I missing?