how to save analysis model in catiav5?

You will have to upload it to the challenge page.
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Step 1:
Go to challenge page and click upload model.
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Step 2:
Select software.
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Step 3:
Click Browse and select the model file. Click Add new version to add STEP/IGES version or any other. Click Browse to add screenshot. Input Model name.
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Step 4:
Click save changes when you are done.