my galaxy S11 will not connect by bluetooth to my mac it is in the list as paired but not connected.
It only shows as 'connected' when there is some actual Bluetooth activity going on between the devices, such as transferring a file. If you're not actually doing anything via Bluetooth between the devices it won't be connected.
i tried this and it still says failed and not connected, thank you anyway
You tried what? Transferring a file? If so, did you enable Bluetooth Sharing in the Sharing system preferences pane?
I had tried transferring a file, but now I have managed to do this thank you - I am an elderly person and did not realise what you meant but now have sorted it.
Retrieving data ...