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I had the same problem, thumbnail appears only if its in JPEG format.
Either you change the format or use the site likes Imgur to copy past the image address

That is weird, it is a Jpeg, eported this one in an adjusted size from Lightroom. I see it happen in more posts. Gonna experiment a bit more with the formats. Thanks for you help!

Thanks that worked, but still strange that my own jpg's dont work.

Its still not visible in thumbnail. instead of orignal use only the imgur jpeg format.

True but it worked in another post

How are you? Avezaath, In case this has been your first Introdusemyself Post i'm here to welcome you to Steemit. I hope you have a lot of fun here and you may follow me. Have a great time @rightuppercorner

Thanks for you welcome :)

Nice to meet you, @avezaath! Welcome to the Steemit Community, wish you good luck and a good start, ive send you a small tip and followed you, hope you have an amazing day! :)

Thansk, that is very kind of you.

I had that problem. For me it were certain characters in the image's file name. When I uploaded 'Pic093234(Medium).jpg', there was no thumbnail. Changing it to 'Pic093234Medium.jpg' worked.

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