MTP in 2018 now 2019

Thanks for your feedback!

The change we made had an unintended side-effect of breaking drag & drop to the folder tree, so in the new beta 12.15.2 we had to make a small change to the change :wink: Hopefully it didn't affect the MTP operation but if you're able to, please give 12.15.2 a try and let us know if you see any problems return.