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Click on 'My Profile' and scroll to the bottom, then choose the image URL.
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Now there's a long URL. Your problem is that the URL you gave is not a picture url- that means it doesn't end in a picture extension, like .jpg , .gif , .png and so on. It leads to a picture gallery showing on particular picture.
What you need to do is go to that URL, right click on the picture and either on "Copy Image location" which will copy the picture url directly or "View Image" which opens the picture by itself in a new window/tab where you can then copy the url.
Here's the proper url: https://twimg0-a.akamaihd.net/profile_images/2471452009/Bart-simpson-bartman-avatar.gif
https://twimg0-a.akamaihd.net/profile_images/2471452009/Bart-simpson-bartman-avatar.gif
What you need to do is go to that URL, right click on the picture and either on "Copy Image location" which will copy the picture url directly or "View Image" which opens the picture by itself in a new window/tab where you can then copy the url.
Here's the proper url: https://twimg0-a.akamaihd.net/profile_images/2471452009/Bart-simpson-bartman-avatar.gif
https://twimg0-a.akamaihd.net/profile_images/2471452009/Bart-simpson-bartman-avatar.gif
