You cannot associate in the definition that the clips and audio are coupled and will float together. What you simply need to do is adjust the duration of the first jpg to match your desired 6:22 duration. Simply right click on the clip "Set Clip Attributes" > "Set Duration...". The other option is to drag the right edge of the jpg clip with the left mouse button in the timeline, when you release mouse button, you will have a few options on what to do.
Keep in mind, timecode is hr:min:sec:frames
Jeff