OK -- replying to my own post
To resolve the issue, I decided to revive the old 'ubtd' app. Its new incarnation has passed the code review and v0.1.1 is now available on the OpenStore.
You will find it under the name "Bluetooth file transfer", in the "Utilities" category.
If you install it, may I suggest that you check the README here: https://github.com/petroniusniger/ratatoskr/tree/main for a brief description of how to use it most effectively?
Also, should you discover any bug, please report them here: https://github.com/petroniusniger/ratatoskr/issues