PE 14 Video/Screenshot number system

I import screenshots and video clips with the following format.

(Screenshot - # or video - #) The "#s" increase incrementally (1,2,3...10,11,12, etc)

When I add them to PE, the Project Assets screen displays them in a sequence based only on the left-most number.

Assume I have 300 screenshots....I find Screenshot 117....the assets screen will show them sequenced as:

Screenshot - 117, 118, 119, 12, 120, 121 - 129, 13, 130, 131...and so on.

Any thoughts how to change this?