Please show how to create the URL for upload

[Max]

I am trying to upload recorded file using

<audio-recorder v-if="showRecorder"
      upload-url="some url"

with some url being linked to a php callback like :

admin_url( 'admin-ajax.php' )."?action=my_action

The callback is called on server side, and audio file can be retrieve.

Nevertheless, how to add more data in upload URL call ?

https://github.com/grishkovelli/vue-audio-recorder/blob/master/src/components/uploader.vue