You can do it from a mobile.
Click on "my profile" at the top of the page.
Click on "album" on the left column on the profile page.
click to start a gallery or on and existing album.
click "upload photos" on the bar going across the screen.
click "add files" at the upper right side.
click "choose file" from the drop down menu.
choose photo from device or pc.
click "upload" I find on phones its easier to upload one picture at a time.
At the bottom of the page you will see the image that you added. on the lower right side of the screen click "Done"
Next title the picture in the box if you want, the click " Save Changes" on the left side of the screen..
DONE!!
seems like a lot but its really not once you do it a few times.
To post a picture on a page if its saved to your album. go to "my profile" go to album, click the image, right click on pc or long press on mobile and click "save image URL"
now go to the post you want to post to and click the picture icon in the reply box, it's the 3rd icon from the right.. it looks like a tree in a picture frame. at the top of the pop up box click from url, and paste the link you copied in the previous step.
DONE.. You can right click and save image url from most website and post it the same way, without having to go to your album.