Organizer 2020 drag'n drop of files to a website

Once upon a time (about 40 years ago...) I started to get to grips with computers. We were taught to clearly distinguish between programs and data. Two programs (organizer and hosting site) and data: photo or video files. You can create those from the organizer and store them anywhere in your computer (even temporarily) and all hosting sites have a way to import those files. Today, most new users don't think like this. They think it's not their own business to do that and that both programs have to 'talk' together to do the transfer. That's what the customer wants, and suppliers do manage to make programs speak together to a wide extent. Nothing is perfect as you know, and beside compatibily issues, letting programs speak together instead of using their own tools for input and output is one of the biggest source of malwares.

Here we are in a situation where the organizer can export files or accept drag and drop to copy files somewhere on your drive.

Your host site wants you to drag and drop video/photo files from your drive to its input location.

Edit:

In other words, both programs use the 'metaphor' of drag and drop, but they don't mean the same thing. Thinking programs versus data is more down to earth, but the idea of a video or photo file on a folder will be more easily understood by different programs.

It appears that the drag and drop does not work in this case while exporting to a temporary folder does work.

My guess is that both programs don't understand each other. The organizer expects the destination of the 'drop' of selected  database links to be a physical folder, whereas the host site expects the 'drag' action to be from a physical drive to an input program connection represented as a virtual folder for the user.