It’s actually possible and also simple and more convenient than the app.
- Log in to your Instagram account via your computer.
2. Right click and select “Inspect”
3. After the window pops on the side, Refresh the page by pressing “Refresh” or “F5”.
4. Note that the buttons you are used to seeing in the app appear.
5. Click the “+”, choose a file from your computer, and from here you’ll see the upload steps from the app!
Hope this helped you.