How to upload photos using official Instagram Windows 10 app.
1) Download Instagram app from Microsoft Store
2) Enable camera and microphone permission (for Instagram stories)
3) Right click Instagram app at taskbar and click New Post. Select photos from Camera Roll or other folders.
4) You can also select photos and then share to Instagram App.
Not working? Try Windowed.io or Ramme.io for uploading photos from any PC to Instagram.