Unable to drag and drop files from Safari download list to other platforms

For about a month ago, since then I am experiencing this issue. Once I have download a file using my safari browser, if I drag the file from the download list that appears on the right hand corner of the screen next to share, and try to drop it to any places that allow file drag and drop upload, or even to send that file via WhatsApp, the file appears to be either not accepted by the platform or some platform even says that the files is corrupted, and some even say that this format is not compatible.

But the file downloads in the download folder and if tried to upload from the download folder, it works like magic.

i have tried several things, like uninstalling all the extensions, resetting the browser and so on, still unable to solve the problem.

I would deeply appreciate if the community helps me out with that.

Thank you!

[Re-Titled by Moderator]