USB in OPO Mobile is shown as disconnected

[AC Question]

in one plus one mobile (ver 12.1yog4...) under storage and " three dots " does not give any MTP option: (shows " USB is disconnected)
How to enable USB under storage tab

 

[B. Diddy]

Welcome to Android Central! Is your phone connected to the computer via USB when you're looking at this menu?

 

[dkuthiala]

Yes , the message is the same when connected to a pc or not

 

[B. Diddy]

Have you already tried different cables? USB cables can fail unexpectedly.