so that devs don't care about the file upload extension or size usage , they just attach it and get the file attached url back and we can use later he can delete the file if he wants.
the extension also has to set the url, same as the web component
also it needs a GotText event to provide the result...
and it will work only together with a php script, which must be installed on the server side
i.e. there is no advantage in using a specific extension...
if you want a solution without installing somethong o the server, then use ftp or scp...
there are already extensions available for that...
for example App Inventor Extensions: FTP | Pura Vida Apps
I do not understand? Why don't you want to provide the php script?
This can be used on your server only together with your url, and that url stays unknown...
as already suggested.. use the web component...