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Any spaces or "forbidden" characters in the file name?
Try to rename the photo to abcd.jpg

https://diptera.i...p?cat_id=2
"Please make sure that you use lower case, because attachments with extensions in upper case (capitals) are rejected. The maximum size is 200000 bytes. Other requirements are: no spaces in the file name, not dots in the file name other than the one in front of the file extension and only alphanumerical characters and '-' and '_' are allowed."