For the pendrive, did you enabled the OTG storage? You will find that under settings System OTG Storage
Yes [ATTACH] Source: https://www.oneplus.in/9r/specs
Press and hold the gmail app Click on app info Advance Battery Set it to don't optimise Force stop the app and restart your phone once and see if it...
Hey @Vartika_Pandey_ they added 9 series in the list https://www.oneplus.in/support/product/protection-service
If you minimise the YouTube app it play for few seconds but not after pause. BTW press and hold the YouTube app App info Storage Clear cache Force...