Can't use my camera and mic under meeting moderator

Hi, everyone.
I have used jitsi meet for conference many times.

Now I tried to use meeting moderator’s service, it got some problems.
When I want to share my screen,
the system showed a orange alert icon without any words(I am a user from Taiwan),
and participates couldn’t receive my voice and video(not only PC’s screen but also camera).

First time I thinked maybe a problem for browser, so I tried run it in Google Chrome and Firefox, but its all useless.


It is my view ,but participates’ side can’t recive(no picture and voice).

How can I solve this problem?
Thank you.