Hi, how I can upload an audio file to Firebase then send it to an app on android ?
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You can use Sparsha's Firebase plugin to do that (and much more).
It's not free, but not too expensive either. Has good documentation, and easy to use.
https://www.constructfirebase.com/
The basic plan includes: Firebase Cloud Storage Basic Plugin that you need.
thanks i have plugins , i bought plugins constructcollection.com
but i do not know how to use it ):
In that case you should ask the owner of that plugin if it contains Firebase Cloud (ability to upload/download files) ?
You can use the chat option (bottom right) on that website.