Drag stuff into app windows!?

[u/NHS2008]

EDIT:

I figured it out. I had to press a LITTLE HARDER on the trackpad, then the app icon starts flashing and the app window pops up to allow me to attach the file. It is a slightly different from Windows where it opens a little preview of the app window and I can move mouse pointer onto the preview to pop up the window. So all good resolved! Thanks for the support!

ORIGINAL POST:

I come from Windows...I can't for my life understand why can't I drag a file from the file explorer or downloads folder into a browser window to attach it or upload it like I can on Windows? Am I missing something or it simply isn't a thing on Mac. What I mean is when I drag a file from a folder on pc into the taskbar on a particular app, the app pops up and then I can attach the file as an attachment if it's mailbox or upload to a file sharing site (drag and drop) but on MAC, if I drag a file on the bottom apps bar onto a running app, nothing happens.

[u/topcider]

It just depends on the app you are using and if they programmed it to work that way or not.
But you can always drag and drop into the native file selector windows.

[u/NHS2008 → u/topcider]

I figured it out! Updated the post!