It seems more appropriate to list posting issues in this topic than the other one. I created an account at ImgBB. I tried to upload a photo to HNI from ImgBB when I was logged in and when I was not logged in and in both cases had the "do not auto delete" option selected.. In both instances, the address would load into the space for addresses for a fraction of a second and then disappear. I tried to load the same image from my computer with the same results. Something is obviously not working correctly. For HNI to automatically depopulate or delete the address in all 3 attempts means something is not working correctly. If it were just my computer, I would think maybe it's me. Since I used the ImgBB website per your instructions, I tend to think the hiccup is on HNI's side.
Also, I have previously been able to load images from ImgBB and my computer so I don't think this is user error.