Disclaimer: I am a JRiver customer. I am not affiliated with the company in any way. Also, these are my limited experiences. I have not touched any A&K players at all, but I have used others.
As far as I can tell, Android based players which use Android File Transfer, are not recognized by MC as handheld devices. So they are not "managed by MC" at all. So how do we use these players with MC? It's a two or three step thing.
The approach is to make a folder on a hard disk that will receive media files from MC. This is a staging area for files to by copied to the A&K. Once the files are there, you then use Android File Transfer to copy those files from that staging folder to the A&K device.
Set up a "handheld" definition in MC:
Tools > Options > handheld > add device
Give it a name that makes sense. Point the "path" to a *brand new empty folder" on your hard disk that will hold these files for later copy.
Now set up your handheld options for the playlist or playlists to transfer, etc, etc. Do a sync. This should copy the files you want to your shiny new Staging Folder.
Once the files are there, it's just like any other Android File copy. Open Android File Transfer and copy the files, from the Staging Folder, to where they go on the A&K.
Deleting files from the A&K is a separate thing that you'll have to manage manually.
I hope this gets you started in the right direction. Good luck!
Brian.