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I think the problem is that you are trying to post pics from flickr.
Try a different image hosting site. 
Imgur gets recommended on BLF a lot. It's pretty good, and easy to use.
I usually use abload (https://budgetlightforum.com/t/-/21257), but that site is in German, so it's not the most user-friendly.
Probably a silly question, but have you seen this thread?
Let’s see if it works
it works!
Yes i have.
!
!
I can only post one image at a time. Cry cry cry. Sophie was one of my gerbils. Sophie had a cut down lemonade carton. I would give her three seeds at a time. She would run and place them in the lemonade carton and them run back to me for more seeds. I gave her pumpkin and sunflower seeds. We did this till the carton was full. Winter stash. She was a cool little girl. She lived in three 20 gallon long aquariums that were connected that also had a wire cage area.
Can just post one image at a time. :(