Because picture links to
Code:
https://mail-attachment.googleusercontent.com/attachment/u/0/?view=att&th=152c75eaf4683e66&attid=0.1&disp=inline&safe=1&zw&saddbat=ANGjdJ8VXEPRxitYtqqvjqdQrq-s_appyIbxcrmyLn2rWOWhb_wX1W2bayHuctXmkkt0Gm3oJXrr6NsJ1k5NXQgTx5w82hm-RSEU_lMULm3LVHXiNK21XaSOdO6mUVgOfVdChSY8k8MHUAVaVUC4o3Z64jb0gVN-w2ugp8n6BFayVjQyiGF6bbCPzxaqOP5wJQa7LAWPXYm4Gj9JxIzLo8erBK0ieCMsUWX6pDesSHg0HhCdlHMayC6-oxl1GixcpkepUBDW0-yZh4IQL9wHw317ibsiy992SNSTB9T39tk0LoiGKvJQc2TPiyd8gb30Fwj9RHwoO8io0xLesZxmYqLnWzHAixu802bBmbkEN5kcNGfPKTd8_4i2oiXezkvG20lNEnjHSDcds4EdR0D6xTM2mNfPWtWQBFLeX85EJXslcKcMGq0D9udbd584Iynik4hAv9ARK6-VMb-DiGFlDNptLQxpzbY6Rbzgh6HhIUFKSn2ySTQnKDCC9ciKKExRKAWtGHg-LgQUonlaIOPVUqrn30OLV1WPfZ3eVHUzlHpBDTPgfwRPkovZhk9vWfq2DJsNOibAoZO0SZIbNpe1s2kk5uCnvgc_-YMf6ogCtBfmYhjhnYQR6jn3niUXuKk
which refers first to a source without a filetype which isn't technically wrong but more of an indicator something doesn't come in an appropriate way and second to a closed party source - in this case from within a mail account only the logged on user has access to. Try to upload to an image hoster such as picload.org or similar and relink from there
