ResourceMediaPath - migx nested in migx

Hello!
I have migx nested in migx. Child migx is used to download files.
The child migx has a file source with (for multiupload):

basePath [[!migxResourceMediaPath? &pathTpl=`/assets/content/files/resources/{id}/`&createFolder=`1`]]
baseUrl [[!migxResourceMediaPath? &pathTpl=`/assets/content/files/resources/{id}/`&createFolder=`1`]]

Because of this, each row of the parent migx corresponds to the same files as specified {id}.

I tried the path:
[[!migxResourceMediaPath? &pathTpl=`/assets/content/files/resources/{id}/{MIGX_id}/`&createFolder=`1`]]
But it does not work. What should I do to delimit the children migx by folders?

There is no easy way to let the mediasource know about the currently used nested MIGX-item. Maybe there is, but not that easy.

If you're planing to have a lot of images within this nested setup, it might be a better aproach to have all of this in custom-tables and use MIGXdb instaed.
Then it should also be possible to seperate the upload-folders for each sub-MIGX-thing.