[Simulink] Question about upsample block

I have one question about the simulink upsample block.

Based on the example from simulink, ex_upsample_ref1, I did the following procedure 1. Signal from workspace with sample time = 1, samples per frame = 1 2. upsample factor L = 4 3. Input processing: frame based 4. Rate options: allow multirate processing 5. Add Signal to workspace for observing the output from the upsample block

I knew the sampling rate of output will become 0.25 times to the input

My question is if simulation time is start from 0, when I run the simulation with simulation stop time = 0

Why I got [0] ? where does the "0" comes from ? Can you help to explain and interpret the result ?

Compared to upsample with the setting (a) frame based and (b)enforcing single rate processing, I can totally understand the result is [0.0065 0 0 0]. Since the sampling rate is both the same for the input and output

Thanks