Make an event when you click on the attachment button

I was trying to upload files directly to my server using the attachment file button, but there was no way I could use the button to my advantage. Also, as of 29th of April 2022 the "OnMessageAttachmentsChanged" event type of LauchEvent is not working properly, so I can't get the files as they get added.

The feature would be an event launched when you click on the button so you can open your own file picker.