The Insert Pictures window is used to insert a group of bitmap images into the
timeline. The names of the picture files must be numbered sequentially, e.g. pic001.gif, pic002.gif, pic003.gif, etc. Click the "Add Pictures" button to specify the first picture and MainActor will search
for the rest of them. You can specify the duration of each picture on the
timeline with the spinboxes. A setting of 00:00:01.00 would mean that each picture
would cover one second on the video.