thank you,
the explanation was very helpful. I had to twiddle a bit with nextcloud and sharing links, but i managed to get a “main” URL containing the link to the .mp3 instead of the one with the query. now is working like a charm ??
in case someone else is wondering:
git clone raw into your app folder https://code.treora.com/gerben/nextcloud-raw and activate from the admin settings of your nextcloud
share a folder: now you can use a link like https://my-nextcloud/apps/raw/s/aBc123DeF456xyZ/path/to/file
for your enclosures
add another app like configurable shares to get “cleaner” links like https://my-nextcloud/apps/raw/s/share-token/path/to/file