Premiere Elements 14/14.1 on what computer operating system?
You appear to be referring to the Time Lapse technique of Numbered Stills.
Those details work in Premiere Elements 14/14.1 Windows.
In contrast, you cannot do Time Lapse capture (Stop Motion) in Premiere Elements 13/13.1 or 14/14.1.
See Adobe document on removed features in 13/13.1. Applies to 14/14.1 also.
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Thank you for the reply.
Best wishes with your Premiere Elements projects. Along the way, if any questions come up, please do not hesitate to ask.