Instagram doesn't have a native desktop client. So you have to depend on your phone to upload photos or videos onto your Instagram account.
But what if you are a professional photographer, you would have almost all your photographs and videos on your laptop. How would you then upload your photos and videos from your desktop on to Instagram?
Well, first you need to log in to your Instagram account from your web browser on your desktop. Now, for Chrome users, right-click on any blank part of the page, and then click on Inspect. If you look at the bottom left, there would be a small tablet icon like the one shown below:
Once you click on that tablet icon, the page will refresh with a mobile view, it would also have a plus (+) sign at the middle of the page like the one shown in the above screenshot. If you can't see it, then you would need to manually refresh the page by pressing the F5 button on your keyboard. Once you can view the plus (+) sign, click on it to upload photos and videos like you do on your mobile.
For Safari users, and mind it, I don't use Safari, go to Preferences -> Advanced. There should be a checkbox towards the bottom of the page that says Show Develop menu in menu bar (or something similar). Check that box, open a new Safari window or tab and click on Develop > User Agent > Safari -- iOS 12.1.3 -- iPhone in the menu bar. Now when you go to your Instagram page, it would show you the plus (+) sign for uploading photos and videos to your Instagram account.
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