How to add a photo to your WordPress post –
1 – From within your post, position the cursor where you want your image to be placed.
2 – Select Add Media, located above the toolbar. The Insert Media screen comes up.
3 – Select Upload Files
4 – You can then either drag your photo from wherever it is to the Media Library or, if you know the file path, you can browse to the file. Either way the image gets added to the Media Library.
5 – You can then Insert into Post like so.
Note: The same procedure can be used for audio and video as well.