Hi @SowmyaR3732, 

You can look for PEGA OOTB Repository APIs for such requirement.

You have to create and configure a repository rule in PEGA first.

Then you can use below DP to perform file manipulation : 

• D_pxNewFolder
• D_pxNewFile
• D_pxGetFile
• D_pxListFiles
• D_pxDelete

If you want to change content source and storage for complete application, then make the change in below path 

Application Definition =>  Integration Tab => Content Management

Hope it helps!

Thanks, Ankit