@HamidRezaAshkiyan Drag and drop is already supported. Can you specify the type of files you are having issues with?
Actually I have problem with every file I want to send.
I'm on windows 10 2004 build 19041
I think it's a problem of your PC, because everything works fine here with 2004. Have you tried to reboot it by chance? In some cases it's enough to fix random issues.
I tried resetting app and rebooting but did'nt work. I'm going to test this on my other PC.
I just installed in another pc and it worked fine. But I'm still experiencing same issue on my pc.
Can you test if it works on Mail app?
That was a very good idea. I have same problem there too.
Then, it's due to Windows, not to Unigram. I advise you to try to post a feedback in Feedback Hub app saying that you can't drag and drop to UWP apps (that will probably ignored) or try a reset.
Thanks
If anyone have same issue by UWP apps: I have fixed this issue by using a windows iso. start exe in iso and upgrade windows (make sure select keep files and apps, otherwise everything will be deleted.) after windows upgrade completed issue should be gone.