I suppose it is not saved as when the registration ends I set blocks for uploading it to FB Storage directly as I would like to not save files in local folders
You have to have a file on device in order to be able to upload it.
3gp recordings are usually saved to shared storage in /storage/emulated/0/Recordings
Check there....
You can set the saved file path to the ASD if you wish.
Any files you create with the app can easily be deleted after upload.
The storage is empty... 
Do I need to install the .apk or it should work even using the AI Companion?
It should work with companion app.
Let me test see where a recording goes on my phone.
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OK, on my device they are going here:
/storage/emulated/0/Android/data/edu.mit.appinventor.aicompanion3/files/My Documents/Recordings/app_inventor_1702488691814.3gp
Try blocks like this:
The recording is saved into files in the ASD and directly uploaded to firebase storage.
Ciao @Robi13,
if You want You can try my FirebaseManager Extension
and then with my sample how I save the files in the storage.
Ciao
Marco
This one seems to be about file locations on the device, not an issue with FirebaseStorage, use of web component is fine for this requirement.