My Computer option is disabled in zoom chat

My computer option is disabled and greyed out for me. That's why I am not able to send any file using My computer Option in chat .I am using Windows 10 and zoom version is : 5.17.11 (34827).

I have tried different ways like making host each other and also restarting zoom, then 

also I have tried using zoom app and zoom web login both way but it didnt work. Not able to choose any file from "My Computer" option.