Problem with DOC in M-FILES

Hello everyone, I got an issue, When we drag a file from the desktop into M-Files, the file name goes into the “Subject” field. We also want M-Files to use the metadata. For example, if we drag a file into a Contract object, M-Files should automatically choose the Contract class. Also, if the contract number is "123456", M-Files should put "123456" in the “Contract Number” field. how can I make it happen ?