I want to share a note in Notability app on my ipad as a white board for an online Zoom lesson. For that I connect my ipad to my mac through cable, and mirror my ipad screen to my mac using the Zoom application's option of share of ipad via cable.
The ipad's screen is mirrored, namely, appears on my mac (usually, sometimes it doesn't and I have know idea why). However, the ipad's Screen Mirroring window (accessed via the ipad's control center) is stuck in a weird intermediate state: it keeps thinking and does not show any devices, but does show a Stop Mirroring button. In addition, Notability app in the ipad does not recognize the mirroring and does not enable the new presentation mode (but rather keeps showing the Send-to button instead of the display-mode button). For some reason, the mirroring occasionally does work fine, but usually it doesn't, and I cannot replicate what causes it to work.
How can this be fixed?
(My mac, ipad and notability are all updated: versions 10.15.4, 13.4, 9.3.1 respectively.)