With a history of both low submissions and low sales, it’s clear that Source Files are ultimately not the best fit for our market. While in some ways more flexible than regular music, the advanced skillset and highly specific / diverse software requirements needed in order to effectively use these items made them a challenge for general buyers, who we have seen are much more interested in production-ready music for their projects.
The good news is that with Music Kits, we’ve worked to combine the best of both worlds here, and create a more universal and ready-to-use music offering that also lends the kind of extra flexibility that previously only Source Files could provide.
As of today, we will be closing the Source Files category from any new item submissions. The existing Source Files items will remain live on the marketplace while we make preparations to officially retire the category in the coming months. Authors and buyers of existing Source Files items will be contacted directly with additional details as they become available.
I think yes, we are allowed to upload existing tracks. Check music kits category, there are tracks from top sellers which are on audiojungle before. I.e. “midnight in tokyo” by BlueFoxMusic, everybody know this track.
Another idea that might work well was to do something like Native Instruments Stems. It is about to sell individual separated channels tracks in a pack. So the video creator can choose for instance create an ambient edit just muting drums for instance.
There was the Miscellaneous section with just two items showing something like this…
But let’s see how musik kits works
I 've got the answer… 
