I think there's a bit of confusion on this. OPUS does use the OGG container irregardless of the file extension. The question here is that Android Media Scanner does not recognize files that end in .opus. It does recognize opus files if they end in .ogg. I can easily append .ogg to the opus file so that the Android Media Scanner picks it up.
So the question is if we can change the extension on opus files from .opus to .opus.ogg so that it will work with Android when we do the device syncing. In currrent state with MusicBee, converting to Opus ends in .opus and if I try to add the .ogg extension manually, the next device sync doesn't pick that change up. opusenc.exe has ability to name the output file whatever you want, but within MusicBee, I believe we are required to use the [outputfile] parameter which has it end in .opus. I tried adding in [outputfile].ogg but it didn't work. Not sure if there is a workaround available to output opus files with the .ogg extension or if code would need to be modified to support this.