Add CV, Add Education, Add Experience: how to make them mandatory

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Hi

Hope someone is able to help me with the following issue. 

My client absolutely need to always have the candidate's cv. Moreover, he would like to absolutely collect some other informations as education ones and work experiences too. 

Since on the job application flow these fields behave like "buttons", it is not possible to make them mandatory (except for the fiscal code that now can be mandatory).

Have you ever faced this requisite? Have you any suggestions / workaroud to implement to be sure that the candidate won't apply without having upload his / her cv...

Thank you in advance!