Almost a decade ago I realized how important it was to host images on your own website, rather than rely on other websites to maintain their images that were referenced in posts on your forum. After just a year or two, you will find many referenced images have either been moved to an updated URL, or completely re-moved from a website.
When that happens, some of your best threads can become absolutely worthless overnight without pictures. Especially if they are DIY type threads, attempting to explain something with the aid pictures.
Don't rely on anyone else, save the integrity of your threads before other websites remove images. It's an add-on, that you will absolutely thank yourself (again and again) for installing!
HIGHLY RECOMMENDED.