Issues with FLV Playback Skins in Animate 2020

Is anybody else having issues with the FLV Video Playback skins in Animate 2020 (v20.5.0). If I try to add video using File > Import Video (on a Mac), I'm taken to the Import Video chooser, which works fine, but in step 2, I can select, but not preview any of the FLV Playback UI Skins. If I continue and then output a swf or projector, I get an error on playback stating that the playback skin .swf is not a supported file type. If I go back to Animate 2019 (19.2.1), there are no issues. I can preview the playback UI skins when I go to File > Import Video and they display correctly when I render the .swf. Is this a bug with the latest version of Animate or am I doing something wrong?