Test for posting images from Google Photos, which has unlimited storage space.
To do it:-
Upload image to Google Photos.
In window that opens: Click on Shared Album.
Pick or name your shared album.
Right click on Photo and click on 'open image in new tab'
Right click on the image in the new tab and 'copy image address'
Switch to your post in Microbehunter pick the Img tab
Paste the copied image address between the Img markers.
DONE.
Edit: Just testing it seems to work sometimes and not others.
Adding the third image to this post:-