I've seen several people having trouble adding an image to forum posts from Imgur.
I've made a quick recording of me showing which Imgur link to copy and which icon to use when making posts on the forum.
I hope it helps people :)
It seems that imgur have had a falling out with the UK regulator so access is no longer available from the UK. Any posts that have an image hosted on imgur now just show a grey box with 'Content not viewable in your Region' in it. Not only that, but if you are in the UK, you can no longer view your own images. A way round it is to connect via a VPN making it look like you are in a different country. That will allow you to download your images at least, although you do lose the date information so you can no longer look at an image and see when you uploaded it.
I've used imgur for many years so had images going back at least 15 years stored on there with the originals scattered around multiple removable drives, my laptop hard drive or have been deleted once uploaded. As this site doesn't have an image upload facility, any pictures in posts need to be hosted somewhere. I've never had any success with linking to images on my Google drive so looked elsewhere and found www.imgbb.com. Works much the same as imgur (but without showing you a load of other peoples uploads before you get to your own).
Using imgbb is much the same as imgur, upload your image, open the image and hit C on your keyboard and a box pops up with embed codes, select Direct Links from the drop down and it gives you a link that you use here. If anything, easier to use than imgur and, like imgur, free to use.