How can I bring in the MATLAB App Designer's Workspace variables back into Base Workspace?

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Hello MATLAB Enthusiasts,
I have made an APP using MATLAB App Designer which does the following operations sequentially as follows-
  1. Runs a MATLAB Script that provids Simulink Model with necessary Input Signals as prerequisite for running the model successfully using the command
eavalin('base','Model_Name');
2. Start simulating the Model (There are several 'To Workspace' blocks to write the Simulink result data to the Base Workspace) using the interactive command from App designer as following
simout = sim('Model_Name','Solver','ode3','StartTime','simstart','StopTime','simend','FixedStep','0.0001');
The model is running perfectly fine but the problem is that, 'To Workspace' signals are not getting logged into Base Workspace (I am not sure about the reason, but I suspect whether App designer has it's separate Workspace)
I tried to use the following command as well to bring the App's workspace (If any) variables to Base Workspace of MATLAB.
simout = sim('Model_Name','Solver','ode3','StartTime','simstart','StopTime','simend','FixedStep','0.0001','ReturnWorkspaceOutputs','on');
3. After capturing the Simulink output signals (using the variables stored in base workspace as a result of using To Workspace blocks in Simulink Model), I need to run another Script which would plot and compare the various engineering parameters with Inputs and Outputs for correlation and comparison as follows
evalin('base','Plot_Script');
However, this is also not working out as expected and is throwing error such as the Simulation output signals are unavailable.
Error:- Undefined function or variable 'Signal_Name'
Now as, I am not able to get the Simulation Output Variables back into base workspace, I am not able to proceed further with the final step.
Please enlighten on this in detail.

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