Web Upload lacks early feedback when choosing large amounts of files

I have searched the existing feature requests, both open and closed, to make sure this is not a duplicate request. • Yes The feature When selecting a large number of files (like 150, 12MP images, or a couple of videos), the input change event (web/src/lib/utils/file-uploader.ts) is only triggered after a couple of seconds or even minutes on slower smartphones. During this time, the website does not know that any files were selected at all, and no UI is updated. This makes it a really bad experience when ingesting data, because you don't know if something is happening or not. Especially when using the shared album with upload function, to let friends upload their vacation images, and they don't know about this limitation. I've built a prototype to verify this: Unfortunately this seems out of our control, and is likely caused by the browser having to load all these images first, before it can create the change event that contains all the file refe…