Hello there,
Please confirm the editor is 'working' and setup correctly it is easy to miss something. Take a look at the Global settings and make sure the Midi controller setup is IN and OUT to Uno Synth Pro so they communicate with each other (See the image in the '1 – Introduction and Settings' of the Manual.
https://download.ikmultimedia.com/plugins/Manuals/UNOSynth/UNO_Synth_Editor_User_Manual.pdfPlease Refer to the Manual.
6.3 – Preset Library: Name
To add a preset from your Mac/PC/iOS device you can drag and drop it in this field, or press import. To delete a
preset, select and press X.
I hope that helps you, I don't own a Mac but this is the correct process, fingers crossed you can get everything working with the above info. Just follow the steps from the start of the Manual if this doesn't work for you.
Regards
James Dyson